Over grazing can easily reverse the grassland succession.
Explanation:An ecological succession is defined as the process of nature undertaking a barren land that was previously not suitable for any life. This process requires time. Here the lichens and fungi first breaks the rocks and produces some humus after death that can be used by other plants whose seeds are brought by wind or birds and they germinate to form the new ecosystem.
Now overgrazing kills the newly formed plants. And the humus content also gets reduced because of the unavailability of the organic matter over the place. So overgrazing will kill these plants and again reverse back the succession to previous forms.
Rank the following technical skills from the most basic to the most advanced.
perform an MRI, repair an EEG machine, read patient charts, calibrate microscopes
read patient charts, perform an MRI, calibrate microscopes, repair an EEG machine
read patient charts, calibrate microscopes, perform an MRI, repair an EEG machine
repair an EEG machine, read patient charts, calibrate microscopes, perform an MRI
Answer:
read patient charts, calibrate microscopes, perform an MRI, repair an EEG machine
Answer:
the answer is c- reading patient charts, calibrate microscopes, perform an mri, repair an eeg machine
Explanation:
just did the unit test review, hope this helps <3
The human disease phenylketonuria has symptoms that include mental problems, chronic skin rashes, and reduced hair and skin pigmentation. Phenylketonuria can be caused by a mutation in a single gene.
Phenlyketonuria is an example of pleiotropy. Based on this, it can be concluded that pleiotropy occurs when
A.
a single gene influences multiple traits.
B.
a trait is influenced by both genes and environment.
C.
a trait is not influenced by genes.
D.
a single trait is influenced by many genes.
Answer:
The human disease phenylketonuria has symptoms that include mental problems, chronic skin rashes, and reduced hair and skin pigmentation. Phenylketonuria can be caused by a mutation in a single gene.
Phenlyketonuria is an example of pleiotropy. Based on this, it can be concluded that pleiotropy occurs when a single gene influences multiple traits.
Explanation:
The correct answer is option( A), a single gene influences multiple traits, exemplified by phenylketonuria where a mutation in the PAH gene leads to various symptoms, showcasing pleiotropy.
Pleiotropy is a genetic concept where a single gene can have multiple effects on an organism's phenotype. This means that one gene can influence several different traits. In the case of phenylketonuria, a mutation in a single gene (the PAH gene, which encodes the enzyme phenylalanine hydroxylase) leads to a variety of symptoms, including mental problems, chronic skin rashes, and reduced hair and skin pigmentation. This illustrates how one gene can have a pleiotropic effect, causing a range of distinct symptoms.
Let's consider the other options to understand why they are incorrect:
B. a trait is influenced by both genes and environment.
This option describes the concept of gene-environment interaction, where the expression of a trait is determined by both genetic and environmental factors. While this is an important aspect of genetics, it does not describe pleiotropy.C. a trait is not influenced by genes.
This statement is incorrect because almost all traits are influenced by genes to some extent. Even traits that are heavily influenced by the environment have some genetic component.D. a single trait is influenced by many genes.
This option describes polygenic inheritance, where a single trait is affected by multiple genes. While this is also an important concept in genetics, it is not an example of pleiotropy, which involves one gene affecting multiple traits.Therefore, the definition that best fits the concept of pleiotropy, as exemplified by phenylketonuria, is that a single gene influences multiple traits."
Which of these is a positive effect of climate change on organisms?
O
A. Reduces atmospheric oxygen
O
B. Provides new habitats
O
C. Reduces niche size
O
D. Increases ocean acidity
SUBMIT
Answer:
Provides new habitats
Explanation:
AP!X STUDENTS
The positive effect of climate change on organisms is that it provides new habitats. The correct option is B.
Climate change can lead to changes in temperature, precipitation patterns, and other environmental conditions.
These changes may lead to the establishment of new habitats or modifications to existing habitats, which may have an influence on many creatures in both good and negative ways. In this instance, the beneficial outcome is the creation of new habitats.
As climate patterns shift, certain regions may become more suitable for certain species or ecosystems.
For example, as temperatures warm in certain areas, species that were previously limited by colder temperatures may be able to expand their ranges or colonize new areas.
This expansion of suitable habitats can provide opportunities for increased biodiversity and ecological resilience.
Thus, the correct option is B.
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Are Pleurococcus and Chlorella
Unicellular or Colonial? Explain pls....
Answer:
Both Pleurococcus and Chlorella are Unicellular algae i. e. made of one cell. Chlorella is a type of green algae which grows in colonial form. There are thousands of cells present in colonial form, each cell perform a particular function. For example, some cells are responsible for movement, some for reproduction etc. The jobs are distributed between these cells. But in Unicellular, one cell perform all functions of life.
Item 4
Which age of river is usually slow and meandering?
mature
youth
middle age
new
PLZZZZ I NEED HELPPPP
Answer:
i think its the second one
Explanation:
Which manufactures ribosomes?
Question 5 options:
nucleolus
nucleus
endoplasmic reticulum
Golgi apparatus
Answer: nucleolus
Explanation: Ribosomes are manufactured in the nucleolus. Ribosomes are the sites where protein synthesis takes place. Ribosomes are usually made up of two subunits: one large subunit and one small subunit. Ribosomes are manufactured and assembled in the nucleolus. Ribosomal proteins combines with four ribosomal RNA strands in the nucleolus to form two ribosomal subunits: one small subunit and one large subunit that make up the complete ribosome
Why did Mendel use pea plants in his experiments?
O
A. They are haploid organisms.
O
B. They have no dominant traits.
O
C. They produce many offspring.
O
D. They are all male.
Answer:
C
Explanation:
Mendel used pea plants in his experiments because they produce many offsprings along with many other reasons like contrasting traits, self pollinating abbility etc.
Mendel used pea plants in his experiments because they are easy to grow and maintain, have easily observable traits, and have both male and female reproductive organs for breeding manipulation.
Explanation:Mendel used pea plants in his experiments for several reasons. Firstly, pea plants are easy to grow and maintain, making them ideal for conducting experiments. Secondly, pea plants have easily observable traits, such as flower color and seed shape, which allowed Mendel to study inheritance patterns.
Lastly, pea plants have both male and female reproductive organs, making it possible for Mendel to manipulate their breeding and study the transmission of traits.
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If the endosymbiont was on its way to becoming an organelle, how would its genome be different from a free-living organism of the same species?
The process of Endosymbiosis generally leads to the production of an organelle in order to perform specific functions in the body of living organisms. This facilitates the alteration in the genome of organisms as compared to the free-living organism of the same species.
What is Endosymbiosis?Endosymbiosis may be defined as a type of process through which one organism lives inside the other and the resulting two typically behave as a single organism. This is caused when both organisms mutually favor or support each other.
According to the context of this question, the cell organelle mitochondria evolved when an anaerobic predator cell (mesokaryote) engulfs alpha-proteobacteria which is aerobic in nature.
Similarly, the chloroplast also originated with the same process of endosymbiosis. After primary endosymbiosis, the resulting organism then engulfs cyanobacteria in order to form a photosynthetic-specified cell organelle known as chloroplast.
Both these process considerably changes the morphology and function of genomic sequences as compared to the free-living organism of the same species.
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An endosymbiont on its way to becoming an organelle would have a genome different from a free-living organism due to reduction in genome size, resemblance of DNA sequence and structure with their bacterial counterparts and the fusion with the host's genes.
Explanation:This question pertains to the process of endosymbiosis, specifically genome fusion, whereby an organism (endosymbiont) becomes an organelle within a larger host organism. The endosymbiont's genome would differ from a free-living organism of the same species in several ways.
Firstly, over time, some of the endosymbiont's genes move into the host cell's nucleus, which results in the reduction in the size of its genome compared with the free-living counterpart. Therefore, endosymbionts usually have smaller genomes, an example of this is mitochondrial DNA which is inherited only from the mother and represents the smallest chromosome.
Secondly, DNA sequence and chromosome structure of endosymbionts closely resemble their bacterial counterparts showing the genetic correlation and origin.
Lastly, the endosymbiotic process often results in the genome consisting of both the endosymbiont's genes and the host's genes. This fusion can be seen as part of the Endosymbiont Theory, which is widely accepted as the mechanism through which eukaryotic cells acquired their mitochondria and chloroplasts.
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Compare the organization of DNA in prokaryotic and eukaryotic cells
Answer: prokaryotic cells have no nucleus, no organelles and a small amount of DNA. Eukaryotic cells do have a nucleus, along with many organelles, and more DNA.
Explanation:
Would you say glucose or sucrose is more complex why
Sucrose is considered more complex than glucose because it is made up of two different sugar molecules bonded together.
Explanation:Glucose and sucrose are both carbohydrates, but they have different structures and properties. Glucose is a monosaccharide, which means it consists of a single sugar molecule. Sucrose, on the other hand, is a disaccharide composed of two monosaccharides - glucose and fructose - bonded together. In terms of complexity, sucrose is considered more complex than glucose because it is made up of two different sugar molecules.
When did faulting along line XY occur
Without details pertaining to 'line XY', it is difficult to give an accurate date of when faulting occurred. Dating in geology often involves analysis of rock layers and contained fossils or minerals, such as the iridium spike discovered in 1980 that led researchers to deduce an asteroid impact causing the K-Pg mass extinction.
Explanation:The question asks when faulting along a specific line, referred to as XY, occurred. Unfortunately, without additional details about the 'line XY', it's difficult to give a precise date. Information like this is typically deduced in the context of geology and earth sciences through various methods such as dating of rock layers and analysis of fossils and minerals present. An example of such practice can be seen with the 1980 discovery by Luis and Walter Alvarez, Frank Asaro, and Helen Michels, when they found a spike in the concentration of iridium within the sedimentary layer at the K-Pg boundary. This discovery led them to hypothesize an asteroid impact which caused the K-Pg mass extinction. To determine the date of faulting along line XY, similar geological detective work would need to be performed.
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what is heredity and how does it relate to genetics
Answer:
Heredity is a process from which traits are transferred from parents to offspring and it is related to genetics because trades are controlled by genes known as genetic code which code the traits.
Explanation:
What happens when sex cells have mutations during replication?
O
A. Silent mutations
O
B. Offspring with mutations
O
C. Formation of proteins
O
D. Problems in somatic cells
ES
When sex cells, also known as gametes, have mutations during replication, the most likely outcome is that the offspring produced will have mutations. Therefore, the correct answer is B.
During the replication of sex cells, errors can occur in the DNA sequence due to various factors such as environmental factors, errors in DNA replication, or exposure to mutagens.
These mutations can lead to changes in the genetic information carried by the sex cells. When fertilization occurs, and the mutated sex cells combine to form a zygote, the resulting offspring will inherit the mutations present in their DNA.Some mutations may be silent, meaning they do not have a noticeable effect on the phenotype or functioning of the individual.However, other mutations can have significant impacts, ranging from mild to severe genetic disorders or abnormalities.Thus, the correct option is B.
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If you go outside on a hot summer day with a double scoop ice cream cone, how will the cold ice cream interact with the hot
outside air?
Heat from the ice cream will move to the air
Cold from the ice cream will move to the air.
Cold from the air will move to the ice cream.
Heat from the air will move to the ice cream
Answer:
D
Explanation:
edge
Thomas is studying the daily electric power used by his town. He has summarized the power consumption of his town over the course of an average day in the which of the following inferences could Thomas make?
Answer:
Thomas is studying the daily electric power used by his town. He has summarized the power consumption of his town over the course of an average day in the which of the following inferences could Thomas make?
Thomas could simply infer the total amount of electric power consumed averagely in a day for his home town which might be multiplied to get a total for a week, month or entire year
Explanation:
Even land that is now very diverse once started out as what?
As of right now, the land is pretty spread out. But millions of years ago, like, we're talking dino time, all the land was just one chunk. This chunk was called Pangaea, or Pangea. But before everything split apart into multiple continents, there was just one; a supercontinent. Hope that helps!
Every piece of land, regardless of its current diversity, initially started as primitive, biologically simple terrain. It later transformed through human agricultural practices, urbanization, colonization, and other socio-economic processes into diverse landscapes.
Explanation:Every land, regardless of its present diversity, started out as a primitive, biologically simpler land. For example, land that now demonstrates agricultural diversity was uncultivated initially and slowly transformed through human farming practices over thousands of years, mutating from a single-crop field to multiple-crop varieties.
In the context of human habitation too, the diverse landscapes we see today were forged through varying cultural, social, and economic processes including colonization, urbanization, conflict, and cooperation over time. For example, the vast forests of New England, which were once untouched, were dramatically altered by early colonial settlers' forest management practices and their urge for expansion.
Land that was originally perceived as wilderness has been transformed into diverse and intricate landscapes by human activity, farming, and urban development. Hence, even regions that express rich and complex diversity today started out as simpler, biologically and culturally homogeneous territories.
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The formation of ova, or female reproductive cells, occurs when diploid germ cells undergo meiosis. In female swamp wallabies (Wallabia bicolor), diploid germ cells contain 101010 chromosomes.
At the beginning of meiosis I, a female wallaby germ cells contains
Choose 1 answer:
(Choice A)
A
10 homologous pairs of chromosomes comprising a total of 20 chromatids
(Choice B)
B
5 homologous pairs of chromosomes comprising a total of 20 chromatids
(Choice C)
C
10 homologous pairs of chromosomes comprising a total of 10 chromatids
(Choice D)
D
5 homologous pairs of chromosomes comprising a total of 10 chromatids
Answer:
(Choice B) 5 homologous pairs of chromosomes comprising a total of 20 chromatids.
Explanation:
Homologous chromosome are those two chromosomes which have same gene but different in shape and appearance.
Chromatids are the identical copies of chromosome. Single chromosome splits into double number of chromatids. In 5 pairs, 10 chromosomes are present so 10 chromosomes splits into 20 chromatids.
The beginning of meiosis I in female swamp wallabies contains 5 homologous pairs of chromosomes, totaling 20 chromatids.
The correct answer is:
(Choice B) B. 5 homologous pairs of chromosomes comprising a total of 20 chromatids.
In female swamp wallabies, which have a diploid chromosome number of 10 (10 pairs of chromosomes), at the beginning of meiosis I, the germ cells contain homologous pairs of chromosomes. Meiosis I is the first stage of meiosis, where homologous chromosomes pair up and undergo crossing over, resulting in genetic recombination.
Since the swamp wallabies have 10 pairs of chromosomes, this means they have 5 homologous pairs. Each homologous pair consists of two chromosomes (paternal and maternal), and during meiosis I, these homologous pairs align and exchange genetic material. Therefore, each chromosome consists of two chromatids due to DNA replication during interphase before meiosis I begins.
So, at the beginning of meiosis I, a female wallaby germ cell contains 5 homologous pairs of chromosomes, comprising a total of 20 chromatids (2 chromatids per chromosome × 10 chromosomes). This configuration allows for genetic variation and the production of genetically diverse ova, essential for reproductive success and species survival.
Write a proposal for three things that could be done to prevent erosion, and explain why they would work.
There are different ways to prevent erosion of soil. They are as follows.
Explanation:Erosion is a natural phenomenon which is caused by friction of soil particles with air, or solution forming with water. This erosion can lead to massive land slides and severe loss of lives with different other loses. So to prevent soil erosion,
Firstly, plants must be planted wherever we get free space. Spaces for plants must be done. The roots of plants anchor the soil particles and resists the action of flowing water and blowing air on soil to wash them away.
Planting grasses on the empty soil is a very good way. The grasses form a mat like structure with their network over the top soil. This prevents washing of soil in case of heavy rain and also prevents degradation of soil quality.
The embankment of ponds or rivers should also be done to prevent landslides into the water bodies.
Implementing vegetation cover, constructing retaining walls, and creating drainage systems can prevent erosion by stabilizing soil, reducing surface runoff, and controlling water flow.
Vegetation cover, such as grass or trees, helps hold soil in place with root systems, preventing erosion caused by wind and water. Retaining walls act as barriers, preventing soil from sliding downhill and controlling the movement of water.
Drainage systems, like culverts or swales, redirect water away from vulnerable areas, reducing the impact of runoff and minimizing erosion. Together, these measures create a comprehensive strategy to protect soil and prevent erosion by addressing different causes and factors contributing to soil loss.
A force is a
A. push B. pull C. Both A and B D. Neither A nor B
Answer:
C.
because a force is what causes an object to move
Which of the following changes on a daily basis
•a shoreline
•a shore
•a beach
•a coast
Answer:
A shore line
Explanation:
Because in a warmer day it goes up to the sand more than it does in the winter
QUESTIONS
1. What are the two main threats to African elephant populations?
Scientists estimate that African elephants are being lost at a rate of Iday.
Answer:
1) Escalating poaching, or illegal killing, for the commercial trade in ivory and meat.
2) Growing demands of exploding human populations and poverty.
The main threats to African elephant populations are poaching, driven by the high demand for ivory, and habitat loss due to human activities such as deforestation and expansion of agricultural lands.
Explanation:The two main threats to African elephant populations are poaching and habitat loss. Poaching is a significant threat primarily due to the demand for elephant ivory, especially in Asia. Elephants are often killed to harvest their tusks, which can sell for high prices on the black market. The second major threat is habitat loss, caused largely by human activities such as deforestation and expanding agricultural land use. As the habitat of elephants shrinks, they come into more frequent contact with humans, often leading to conflicts.
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explain why the north American cactus and African euphoria species have evolved such similar adaptations.
Answer:
The North American Cactus and African Euphorbia species originated from two different, but similar plants.
Explanation:
These plants were the typical herbaceous species of the early Earth, characterised by their slim stems and large, wide leaves. However, their evolutionary paths began to change with the separation of the early supercontinents, Pangaea and Gondwana. As variations in the climate caused the development of harsh, arid, desert environments, both plant families experienced convergent evolution in order to adapt and survive. Cacti and Euphorbias both converged on similar forms and metabolisms after prolonged exposure to corresponding environments, due to the fact that similar biomes can require the same adaptations.
Adaptations
Branching Stems Covered In Longitudinal Ribs Smaller leaves And Short Spines Spreading, Shallow, Fibrous Root System Water Storage System - Succulent Stems Crassulacean Acid MetabolismHope u will understand this
When humans chose the traits they want in offspring it is called?
Answer:
Artificial selection or selective breeding
Explanation:
The process of artificially selecting traits by humans is known as artificial selection. It is against the process of natural gene selection which allows for evolution to occur.
Desired traits and character states are favored over others. They are usually employed in agricultural practices which helps to produce more viable and adapted plant and animal species.
1) Describe how chromosomes and genes are related. (3 points)
Answer: Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.
Explanation:
WHY DO SCIENTISTS CONTINUE TO ADD NEW KINGDOMS TO THEIR SYSTEM OF CLASSIFICATION?
Answer:
Scientists continue to add new kingdom to the system of classification because with the passage of time new organisms are discovered which have unique properties. These organisms donot fit to place in kingdom of classification. For example, protists are the organisms having both plants and animals characteristics so it cannot be placed into plants or animals kingdom so scientists make a new kingdom named protista.
Answer:
because with the passage of time new organisms are discovered which have unique properties
Explanation:
The energy released when sugar molecules are
broken down is stored in
(1) minerals
(3) DNA
(2) ATP
(4) wastes
Answer:
The energy released when sugar molecules are broken down is stored in ATP
Explanation:
Answer:
Atp
Explanation:
similarities and differences between these two topics. Compare and contrast the
usefulness of scientific research on our society with the usefulness of space research on
our lives on Earth
Scientific research and space research both contribute significantly to human knowledge and technological advancement. However, scientific research, covering diverse fields, more directly impacts daily lives, including health and environmental sustainability. Space research, while often viewed as abstract, provides unique benefits, including technological applications like GPS, weather prediction, comprehension of our universe, and a backup survival plan for humanity.
Explanation:Both scientific research and space research have immense importance for our society. Similarities between these two stem from the fact that they both push the boundaries of human knowledge, bring technological advancements, and have potential to radically improve our lives.
However, their usefulness differs in context. For instance, scientific research revolves around various fields such as medicine, physics, chemistry, etc., producing insights which directly affect our everyday lives (such as development of new medicines or sustainable technologies). On the other hand, space research, while sometimes seen as a more abstract application of science, delivers distinctive benefits. It leads to the development of new technologies (GPS, weather prediction, broadcasting) that we commonly use, contributes to our understanding of the universe, and even provides a contingency plan for human survival in case the conditions on earth become unsustainable.
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What type of rna is produced in the nucleus
Answer:
mRNA
Explanation:
Messenger RNA produced in the nucleus and go to the cytoplasm. In cytoplasm two other types of RNA ribosomal and transfer RNA present that read the sequence of mRNA and produce protein molecule.
A map's orientation is typically determined by a/an
A. Legend
B. Grid pattern
C. Index
D. Compass rose
A map's orientation is typically determined by a Compass rose.
Option: (D)
Explanation:
A compass rose is also known as a wind rose or ‘rose of the winds’. It is used to term for the graduated markings found on the ‘traditional magnetic compass’.
A figure on a compass, map, nautical chart, or monument used to display the orientation of the primary directions, east, west, north, and south and their intermediate points.
A map indicates the real world. By orienting a map, we are positioning to the direction North is actually pointing north.
When we orient a map and know where you are on the map, you can look in a certain direction and see a real landmark and find it on the map.
Answer: Compass Rose
Explanation:
A compass rose is used to determine a map's orientation. It's a circular figure on a map that indicates direction.
Tracy mixed cyclohexane and ethanol in a test tube. Calculate the angle of refraction of 26.8° light shines from the ethanol into the cyclohexane. The indices of refraction for cyclohexane and ethanol are 1.43 and 1.37, respectively.
Answer:25.4
Explanation:because i got it correct
To find the angle of refraction when light passes from ethanol to cyclohexane, you use Snell's Law with the given indices of refraction and the angle of incidence. Calculate sin(θ2) and then use the inverse sine function to find the angle of refraction (θ2).
Explanation:To calculate the angle of refraction of light passing from ethanol into cyclohexane, we can use Snell's Law, which is n1 × sin(θ1) = n2 × sin(θ2), where n1 and n2 are the indices of refraction of the two media, and θ1 and θ2 are the respective angles of incidence and refraction. Given that the index of refraction of ethanol (n1) is 1.37 and that of cyclohexane (n2) is 1.43, and the angle of incidence (θ1) is 26.8°, we can solve for the angle of refraction (θ2).
Applying Snell's Law:
1.37 × sin(26.8°) = 1.43 × sin(θ2)
First, calculate the sine of the angle of incidence and then divide by the index of refraction for cyclohexane to find the sine of the angle of refraction:
sin(θ2) = (1.37 × sin(26.8°)) / 1.43
After calculating sin(θ2), use the inverse sine function to determine the angle θ2, which is the angle of refraction.
Substitute the values into the equation and solve for the angle of refraction (calculations not shown here as they require a calculator).