Answer:
Lymphocyte, specifically, B-lymphocytes
Explanation:
Lymphocytes are a kind of white blood cells, or leukocytes. They are divided into two categories, which are B-lymphocytes and T-lymphocytes.
B-lymphocytes are the ones that produce antibodies and each b-lymphocyte produce a specific antibody. They are triggered by antigens that are specific to them, which stimulates the production of plasma cells, which are responsible for producing antibodies.
The type of leukocyte that produces antibodies is called a B-lymphocyte or B cell.
B cells are a type of white blood cell that plays a crucial role in the immune response. When the body is exposed to foreign substances, such as pathogens or antigens, B cells can recognize these molecules and produce antibodies to neutralize them.
When a B cell encounters an antigen that matches its specific receptor on its surface, it becomes activated. The activated B cell undergoes a process called clonal expansion, where it divides and produces many identical daughter cells called plasma cells. Plasma cells are responsible for the production and secretion of antibodies.
Therefore, B cells produce antibodies.
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owls eat mice.what do we call the mice?
A.prey
B.predators
C.nutrients
Answer:
A.prey
Explanation:
The owl would be called the predator because it is going after the mice. Therefore, the mice would be called prey. Mice are also nutrients but, nobody uses that word in this situation.
Answer:
Explanation:
LOL! I'm not taking your question lightly. I think the answer you want is Prey. However, from the Owl's point of view, probably you could answer nutrients. Mice are not predators. Mice are in the middle of the Food Chain. Grass or grains are on the bottom and the Owl is on top.
Thank you for the question.
The response of plants to periods of light and dark is called ______________. photoperiodism nocturnal variation daily activity seasonal variation
Answer:
Photoperiodism
Explanation:
The term "photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photoperiod: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
In anaphase, sister chromatids separate and become full-fledged chromosomes that move to opposite poles.In anaphase, sister chromatids separate and become full-fledged chromosomes that move to opposite poles. In telophase chromosomes become less condensed and new nuclear envelopes form. In cytokinesis the cytoplasm divides.In telophase chromosomes become less condensed and new nuclear envelopes form. In cytokinesis the cytoplasm divides. Most of the cell's life is spent in interphase, when growth occurs. Cells that are about to divide replicate their DNA.Most of the cell's life is spent in interphase, when growth occurs. Cells that are about to divide replicate their DNA. In prophase microtubules form the mitotic spindle, and the nuclear envelope breaks up.In prophase microtubules form the mitotic spindle, and the nuclear envelope breaks up. At metaphase, the mitotic spindle is fully formed and chromosomes are lined up in the center of the cell.At metaphase, the mitotic spindle is fully formed and chromosomes are lined up in the center of the cell.
Answer:
Good Job
Explanation:
Which of the following are advantages of endospores? Endospores reproduce more quickly and are more resistant to environmental toxins than vegetative cells. Endospores are more resistant to dry conditions and are more efficient at producing ATP than vegetative cells. Endospores reproduce more quickly and are more efficient at producing ATP than vegetative cells. Endospores are more resistant to dry conditions and are more resistant to environmental toxins than vegetative cells.
Answer:
B. Endospores are more resistant to dry conditions and are more efficient at producing ATP than vegetative cells.
D. Endospores are more resistant to dry conditions and are more resistant to environmental toxins than vegetative cells.
Endospores are highly resistant to dry conditions and environmental toxins, serving as a survival mechanism for bacteria in harsh environments. They do not focus on ATP production or reproduction while in their dormant state. Hence, the last option is correct.
Endospores serve as a survival mechanism, ensuring the bacterial genome can endure periods where conditions are not conducive for the active, metabolically functioning vegetative cell. They withstand a plethora of harsh environments including desiccation, chemical exposure, extreme temperatures, and even radiation. However, they are dormant and do not perform activities such as ATP production or reproduction during this state. When favorable conditions return, an endospore can germinate to become a vegetative cell.
In 1928, Frederick Griffith conducted an experiment in which he injected mice with different kinds of bacteria. When bacteria that cause disease (pathogenic) were injected in healthy mice, these mice got sick and died. Other types of bacteria (nonpathogenic) did not cause the mice to die. Griffith took the DNA from dead pathogenic bacteria and transferred it into living nonpathogenic bacteria. These altered bacteria were then injected into healthy mice. The mice died of the same disease caused by the pathogenic bacteria. Based on this information, which statement would be a valid conclusion?
a) When an organism dies, the DNA changes; it no longer provides the same genetic information.
b) When DNA from one organism is transferred to another organism, the DNA no longer functions.
c) DNA in different types of bacteria carries exactly the same type of information.
d) When DNA from one organism is transferred to another organism, it can give new traits to the second organism.
The statement that would be a valid conclusion is as follows:
When DNA from one organism is transferred to another organism, it can give new traits to the second organism.Thus, the correct option for this question is D.
What is DNA?DNA may be defined as a type of genetic material that encodes the genetic information of an individual and governs the process of transformation of traits and genotypes from one generation to another. DNA stands for Deoxyribonucleic acid.
According to the experiments performed by Frederick Griffith, it can be revealed that when the DNA of one organism is transferred to another organism, it can give rise to new traits in the second organism.
This is because it is plausible for DNA to be changed either through mutation or the introduction of foreign DNA.
Therefore, when DNA from one organism is transferred to another organism, it can give new traits to the second organism is a statement that would be a valid conclusion.
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Final answer:
The correct conclusion from Frederick Griffith's 1928 experiment on bacterial transformation is d) When DNA from one organism is transferred to another organism, it can give new traits to the second organism, as seen when non-pathogenic R strain bacteria transformed into pathogenic S strain bacteria after acquiring DNA from the heat-killed S strain.
Explanation:
In 1928, Frederick Griffith conducted an experiment that demonstrated the process of bacterial transformation. He observed that when he injected mice with a mixture of live R strain (non-pathogenic) and heat-killed S strain (pathogenic) of Streptococcus pneumoniae, the mice died of pneumonia. The live R strain had absorbed the DNA from the dead S strain, gained a capsule, became pathogenic, and thus transformed into the S strain. Consequently, this led to the conclusion that DNA carries genetic information which, when transferred to another organism, can endow it with new traits.
Based on these observations, the correct answer to the student's question is d) When DNA from one organism is transferred to another organism, it can give new traits to the second organism. This aligns with the experiment's results indicating that DNA is the material responsible for heredity and that it can transform the phenotype and genotype of an organism when it is absorbed from the environment.
Choose the best explanation of the difference between evolution and natural selection.
A. Natural selection is the idea that species change over time, and evolution is the idea that our world changes over time.
B. Evolution is the idea that species change over time, and natural selection is the idea that nature changes over time.
C. Natural selection is the idea that species change over time, and evolution is the idea that the species' food source also changes over time.
D. Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
Answer:
Evolution is the change in the characteristics of a species over several generations.
Natural selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Explanation:
The correct answer is D. Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
Explanation:
In biology, the word "evolution" refers to the changes in terms of genes (Genotype) and observable traits (phenotype) species undergo over time or through successive generations that led to changes within species but also to the emergence of new species as the result of mutations, genes changing or event genes being combines. On the other hand, the natural selection is one of the main mechanism that explain evolution, because natural selection refers to the prevalence of certain features that support survival and reproduction and that because of these are inherited which means those traits remain while other traits that are not favorable disappear over time which implies changes in species or evolution. Therefore, the statement that shows the difference between evolution and natural selection is "Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place".
Which tube is cut to produce sterility in the male?
The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following?Different organisms have different numbers of different types of amino acids.DNA was the first genetic material.The same codons in different organisms translate into the different amino acids.A gene from an organism can theoretically be expressed by any other organism.All organisms have experienced convergent evolution.
Answer:
Here is the correct option: A GENE FROM AN ORGANISM CAN THEORETICALLY BE EXPRESSED BY ANY OTHER ORGANISM.
Explanation:
The theory of evolution has clearly showed us that all living things on earth have common ancestors. This fact has been established by the study of genetic materials in different organism. The similarity between two organisms can easily be measured by the amount of DNA that the organisms have in common. Because, the genetic code in all living organisms are essentially the same, genes from a particular organism can be expressed by another organism. A good example of this is seen in the use of PCR (Polymerase chain reaction) in which a DNA from a human can be replicated and multiply by a bacteria.
An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the:
A. inner ear
B. middle ear
C. eardrum
D. hammer/anvil
Answer:a inner ear
Explanation: because the ear drum
(Please help me out here..)
Over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences:
-The fossil record shows that different types of organisms have existed at different times in Earth's history.
-Many organisms have similar body structures that seem to be adapted to different ways of living in their environment.
-Organisms of different species often share similarities in stages of embryonic development.
-Many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins.
-Often, the extent of two species' similarities can be predicted from their geographic closeness to each other.
-A great deal of change has been observed among species that have experienced strong selective pressures through many generations.
------
Scientists have carefully considered and rigorously tested the observations listed above.
When scientists offer a ____ of these observations, they are making a____.
1.) Testable Explanation, Deductive Explanation
2.) Scientific Interference, Scientific Law
Answer:
The correct answer will be option-
1. Testable Explanation
2. Scientific Law
Explanation:
A scientific investigation involves the scientific method to explain any natural phenomenon.
All the given statements the statements which can be tested that is they are the hypothesis which can be tested through the scientific experiments. When the experiments by researchers test and supports the hypothesis provides the facts then these scientific hypothesis gets transformed wither as a theory or law.
Thus, the selected options are the correct answer.
The moon exerts a grater influences than the _____ because it’s closer
A.sun
B.earth
C.jupiter
A.
The moon is responsible for many of the tidal forces on Earth.
Answer:
A. Sun
Explanation:
For an animal living a diplontic cycle, meiosis is limited to:
producing gametes
producing growth
fertilization
development of the zygote
Sea levels are rising due to climate change while increasing numbers of people are moving into coastal areas. To accommodate more people, there has been increased construction of beachfront resorts and condominiums. How is this impacting sea turtle numbers and biodiversity and why?
A. The increased human population in coastal areas has meant that more food is available to the turtles (e.g., dropped food, waste from restaurants), which has led to an increase in the numbers and diversity of sea turtles.
B. There has been very little change in the numbers and biodiversity of sea turtles because the planet is so vast that they can simply relocate to less crowded beaches.
C. This has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction.
D. This has resulted in an increase in numbers and diversity of sea turtles because people are around to protect them from natural predators.
Answer:C
Explanation:
Answer:
C. This has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction.
Explanation:
Climate change has become an increasing threat to all species across the planet. The adverse effects of the changing climate are transferred to the ocean, where the temperature of the sea surface is increasing and rising sea level can change the marine ecosystem at many levels.
And sea turtles in one species that is affected much by this climate change. Since the sea turtles lays their eggs on the sand beach and spend rest of their lives in the ocean, climate change is affecting their life on both the sea and the ocean.
As given in the question that there is a rise in the sea level due to climatic change while there is an increase in the numbers of people moving into the coastal areas. To accommodate these people, there has been increased construction of beachfront resorts and condominiums. But this will lead to less availability of beach sand for the sea turtle for breeding and to lay eggs. Thus there is a decrease in the number of the these species.
What is the role of DNA helicase during DNA replication? A. To unwind the duplex DNA B. To attach primers to the replicating strands C. To add bases in the sugar-phosphate backbone
Answer:
A
Explanation:
DNA Helicase 1)unwinds and 2)unzips the double stranded DNA molecule by breaking the hydrogen bonds between complementary nitrogenous bases.
Primase catalyses the addition of primers to DNA to provide a 3'-OH group that DNA polymerase can add free deoxyribonucleotides (or deoxyribonucleoside triphosphate) to elongate the primers during DNA replication.
DNA polymerase catalyses the addition of free DNA nucleotides to complementary bases and catalyses the formation of phosphodiester bonds between 3'-OH group of a DNA nucleotide and 5'-phosphate group of another DNA nucleotide.
Frutose and glucose are examples of ____.
Polysaccharide
Disaccharides
Isomera
Plastide
Many wild orchids cannot be successfully dug up and transplanted because they need the native mycorrhizae (a fungus) in the soil to survive. What kind of interaction is this?View Available Hint(s)mutualismparasitismcompetitionherbivory
Wild orchids and mycorrhizae demonstrate mutualism, with the fungi providing nutrients for seed germination and growth, while the orchids give sugars upon photosynthesis.
The interaction between wild orchids and native mycorrhizae in the soil is a form of mutualism. Orchids produce tiny seeds that lack sufficient nutrients to support their germination and initial growth and therefore depend on a symbiotic relationship with mycorrhizal fungi, usually Basidiomycetes, for essential nutrients and carbohydrates. The fungus receives sugars from the orchid once it can photosynthesize, creating a mutually beneficial relationship. This mutualistic interaction is crucial throughout an orchid's lifecycle.
The ability of an organism to ______ (assimilate or adapt) to it's environment is due to potential variation.
Answer:
i believe its adapt
Explanation:
given enviroment are called adaptations.
Please help!!!
Which of the following best describes how the process of mitosis results in the formation of new cells?
A. Cells grow during prophase, their DNA replicates during metaphase and separates into two nuclei during anaphase, and the cytoplasm divides during telophase.
B.DNA condenses into chromosomes during prophase, chromosomes line up during metaphase and separate during anaphase, and separate nuclei form during telophase.
C. Roma zones replicate during prophase, separate during metaphase and replicate again during anaphase, and nuclei form around the chromosomes during telophase.
D. Chromatids separate during prophase, replicate during metaphase and are pulled to opposite ends of the cell during anaphase, and cytokinesis it’s a cell in half during telophase.
Answer: B
Explanation:
Answer:
B.DNA condenses into chromosomes during prophase, chromosomes line up during metaphase and separate during anaphase, and separate nuclei form during telophase.
Explanation:
just took test and got it right
Celery kept in the refrigerator for several days becomes limp why does this happen
Answer:
Because celery has losen the cell turgidity.
Explanation:
Celery (Apium graveolens) belongs to the family Apiaceae, is a marshland plant. Celery is used as a salad and its extract is used fro the preparation of herbal medicine.
Celery when kept in refrigerator for several days becomes limp as celery lose its water content and become dehydrated. The cell turgidity has been lost and celery wilt.
Which one of the following is true of tRNAs?
a) tRNAs are double-stranded.
b) Each tRNA binds a particular amino acid.
c) There are four types of tRNA.
d) tRNAs carry special sequences known as codons.
e) All of the above
Answer:
Option B
Explanation:
tRNA are single stranded just like most of the RNAs. Hence option A is incorrect. Due to the presence of specific L shaped structure, tRNAs bind specifically to only certain amino acids. Hence, option B is correct
There can be nearly 20 types of tRNAs based on the type of amino acids also their grouping can be done based on anticodon. Hence, on basis of amino acid, there can be 20 types of tRNAs. Hence, option C is correct
tRNAs carry anticodons that are made up of three nucleotides. Hence option D is also incorrect.
Option B is correct
The correct answer is that each tRNA binds a particular amino acid.
Explanation:The correct answer is b) Each tRNA binds a particular amino acid. transfer RNAs (tRNAs) are single-stranded molecules that play a crucial role in protein synthesis. Each tRNA molecule binds to a specific amino acid and carries it to the ribosome, where it is added to the growing protein chain. tRNAs have a specific three-nucleotide sequence called an anticodon, which recognizes and pairs with a complementary codon on the mRNA during translation.
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Deer Cave cannot support photosynthesis is as not enough sunlight is present. In spite of this, it still has a complex food chain. What is the energy foundation of this food chain?
Answer:
A cave is a prime location for bats of all species.
Explanation:
Bat dung, or guano, on the cave floor has it's own ecosystem of insects, and other animals that feed on the guano, creating a self contained ecosystem.
Answer:
The energy foundation in a deer cave ecosystem are the organic material, such as guano, other animal droppings and washed-in plants during flooding. Excess rainwater washes leaves, twigs and plants into a cave, providing munchies for insects and other animals.
Explanation:
The food chain in the cave start from the poop of bats known as guano, other animal droppings and washed-in plants that provide nutrients for fungus and microscopic bacteria. Then, millipedes and tiny crustaceans feed on the fungus, bacteria and the nutrients left behind. Bigger insects, such as cave beetles, feed on these millipedes, crustaceans and even the eggs of cave crickets. Centipedes, cave spiders, salamanders and cavefish feed on insects smaller than them. Some cave centipedes grow so large that they feed on bats.
How are endocrine and exocrine glands different from each other?
Answer:
Endocrine, or ductless glands, while Exocrine glands are all ducted glands.
Explanation:
Endocrine glands secrete substances (like hormones) into blood without the use of ducts, whereas exocrine glands use ducts to secrete substances into the external environment.
Endocrine and exocrine glands are differentiated by how they release their secretions. Endocrine glands release hormones directly into the bloodstream, whereas exocrine glands release their secretions through ducts onto epithelial surfaces.
Explanation:The endocrine and exocrine glands are types of glands in the body's system that classified based on how they release their secretions in the body. Endocrine glands are referred to as 'ductless glands' because they release hormones directly into the bloodstream where they travel to target tissues. Examples of endocrine glands include, the pituitary, thyroid, and adrenal glands.
On other hand, Exocrine glands release their secretions through ducts onto epithelial surfaces, such as the skin or the lining of the stomach or intestines. Examples of exocrine glands include sweat, salivary, mammary glands and liver that releases bile.
In summary, the main difference between endocrine and exocrine glands is/how/ they release their secretions in the body.
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Creating new biofuels is an example of ____. A) white biotechnology B) red biotechnology C) blue biotechnology D) green biotechnology
Answer:
A. White biotechnology
Explanation:
White biotechnology is also known as industrial biotechnology. White biotechnology converts microorganisms and enzymes into industrial goods like chemicals, plastics, and energy supply.
Biofuel is fuel made up of organic matter and are mostly used for transportation. A good example would be ethanol which is mixed with petroleum. The mixture increases the combustion performance and decreases the carbon monoxide emmisions of the vehicle.
In the biosphere, what acquires carbon present in the atmosphere
Answer:
Plants.
Explanation:
Plants(namely, trees) absorb the carbon from the atmosphere and stores it within thenselves.
Answer:
The correct answer would be - Autotrophs or green plants.
Explanation:
Terrestrial autotrophs in the terrestrial biosphere capture the carbon present in the atmosphere in the form of the carbon dioxide directly to perform the photosynthetic process from the air. On the other hand, the marine biosphere the marine autotrophs obtain carbon from the water in the dissolved form of carbonic acid.
The autotrophs or the green plants present in both biosphere incorporated the carbon from the atmosphere into the biosphere.
Thus, the correct answer is - autotrophs or green plants.
leopold's genotype is xY. what does this mean?
A.leopold had hemophilia
B.leopold did not have hemophlilia
C.leopold was a carrier of hemophilia,but did not have the disease
D.leopold's daughter would have hemophilia
The trachea needs to be rigid but the esophagus does not. why is this
"The trachea needs to be rigid to maintain an open airway for breathing, while the esophagus does not need to be rigid because its function is to transport food to the stomach.
The trachea, also known as the windpipe, is part of the respiratory system and serves as a conduit for air to travel from the pharynx to the bronchi and into the lungs.
To ensure that this passageway remains open for the continuous exchange of oxygen and carbon dioxide, the trachea is reinforced with C-shaped cartilage rings. These rings provide structural support and prevent the trachea from collapsing during inhalation and exhalation.
In contrast, the esophagus is a muscular tube that connects the pharynx to the stomach. It transports food and liquids to the stomach through peristaltic contractions, which are waves of muscular contractions that move down the esophagus. The esophagus does not require rigidity because it does not need to remain open all the time; instead, it is a collapsible tube that expands as food passes through it. The flexibility of the esophagus also allows it to navigate the curvature of the spine and the movement of the diaphragm during breathing.
In summary, the rigidity of the trachea is crucial for maintaining a patent airway, whereas the flexibility of the esophagus is essential for its role in swallowing and accommodating the passage of food of various sizes and consistencies."
Which of the following scenarios would prevent a population from being in Hardy-Weinberg equilibrium?
A. The population will fall out of Hardy-Weinberg equilibrium if natural resources such as food are limited.
B. The population mates at specific times of the year, causing the population to fall out of equilibrium at that time of year.
C. The population is stable, but younger generations of the population have a different allele frequency.
D. The population is evolving, and natural selection is favoring one allele over another.
Answer:
D
Explanation:
One of the assumptions of the Hardy Weinberg equilibrium is that the population should not experience mutations. Mutations are usually the base on which natural selection acts by selecting the advantageous alleles and weeding out the disadvantageous ones. This is how populations evolve.
Other assumptions of this equilibrium are; there should be no migration (hence gene flow), the population is infinitely large, and mating is random.
The Hardy-Weinberg principle holds under specific conditions. Any scenario causing evolution, such as natural selection favoring a specific allele, will prevent a population from maintaining the Hardy-Weinberg equilibrium.
Explanation:The Hardy-Weinberg principle describes the conditions under which a population's genetic variation remains constant from one generation to the next. The populations that are in Hardy-Weinberg equilibrium should satisfy five assumptions: no mutation, random mating, no gene flow, infinite population size, and no selection. Out of the given options, the scenario which would prevent a population from being in Hardy-Weinberg equilibrium is 'the population is evolving, and natural selection is favoring one allele over another'.
This scenario, also known as selection, violates the principle's assumption of no selection. If natural selection occurs, and certain alleles confer survival advantages leading to their increased future prevalence, the genetic makeup of the population will change. Hence, the Hardy-Weinberg equilibrium will be disturbed.
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We all have different forms of genes from our parents what are these different forms called?
A.alleles
B.characters
C.DNA
D.resources
Answer: The different forms of genes from our parents are called alleles.
Which of these are by-products of cellular respiration?
A) heat, carbon dioxide, and water
B) ATP, carbon dioxide, and water
C) ATP and carbon dioxide
D) glucose, carbon dioxide, and water
E) carbon dioxide and water
The by-products of cellular respiration are ATP, carbon dioxide, and water. Thus, the correct option is B.
What is Cellular respiration?Cellular respiration may be defined as a type of chemical process that involves the breakdown of food in the cell with the release of energy in the form of ATP. It is also known as aerobic metabolism, aerobic respiration, and oxidative metabolism.
This metabolic reaction takes place inside the cell of each living organism in order to derive energy from foodstuff and release waste products.
During the process of cellular respiration, glucose and oxygen reacts with each other and finally result in the liberation of ATP, carbon dioxide, and water. In which carbon dioxide is released as a waste product.
Therefore, ATP, carbon dioxide, and water are the by-products of cellular respiration. Thus, the correct option for this question is B.
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Answer:
heat, carbon dioxide, and water
Explanation:
ATP is not considered a by-product.
A geologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. Based on this information, the sample mineral has to be softer than A. orthoclase. B. corundum. C. fluorite. D. apatite.
Answer:
B. Corundum
Explanation:
Using the Mohs scale of hardness, the mineral has a hardness greater than 6.5 (Steel nail) but less than 8.5 (Drill bit). The corundum has a hardness of 9.0, which means it cannot be scratched by a drill bit, but all the other choices have a hardness scale less than 6.5 but the mineral was not scratched by the nail. So the best answer would be B.
Based on the given information,corundum is a mineral that can't be scratched by a steel nail but can be scratched by a masonry drill bit.The correct option is B.
Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.
If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.
Using the Mohs scale of hardness, mineral hardness is determined.The hardness of steel nail is 6.5 and that of drill bit is 8.5 . The corundum has a hardness of 9.0, which means it cannot be scratched by a drill bit, but all the other choices have a hardness scale less than 6.5 but the mineral was not scratched by the nail.
Thus, option B is correct.
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