Answer:
The condition of the Earth had to become favourable before it could support any form of life.
The formation of the different layers around the earth like the ozone layer was necessary before life could originate. Primitive species such as some prokaryotes were able to live in hydrothermal conditions during the initial times. With the passage of time, as the concentration of oxygen increased due to photosynthetic prokaryotes, situations became favourable for eukaryotic organisms to arise.
What are two factor that can affect the PCB level whales
Answer:
PCBs- polychlorinated biphenyls cause cancer, suppress the immune system, disrupt hormonal signals and impair reproduction.
Explanation:
1. Widespread
PCBs can easily be spread, they often fail to remain in the medium in which they are released, moving instead within and between different phases or compartments of the environment (atmosphere, soil, sediment, and water). Plankton ingest the PCB, fish consume the plankton and whales eat the fish. With this tier of food Web, PCB becomes more concentrated.
2. Global purification
Though the use of PCB is banned in most countries, it's widespread usage lead to its remaining in the ecosystem and being spread further in the ocean.
How is the temperature of a solid substance affected when it is melting?
O A) It increases.
OB) It decreases.
O c) It stays the same.
Answer:
the temperature increases.
Explanation:
the melting point of every piece of matter is different, but they all reach that point at a certain temperature
Answer: A). It increases.
Explanation: The temperature of a solid substance increases when it is melting. Increase in temperature makes the particles of the solid to gain kinetic energy and as the kinetic energy of the particles increases, the bonds between the particles are broken thus resulting in melting of the solid.
As ocean depth increases, pressure increases, and temperature decreases. True False
Answer:
This is true.
Explanation:
Which idea was Lamarck's theory of Evolution based upon?
natural selection
variation in populations
inheritance of acquired traits
descent with modification
Answer:
The Correct Answer is D. Natural selection provided a better explanation for what they observed in the natural world.
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Why are rapidly occurring environmental changes more likely to cause extinctions than slowly occurring changes?
Slow changes allow time for adaptation.
Rapid changes require little adaptation.
Slow changes affect only small regions.
Rapid changes have a global effect.
Slow changes allow time for adaptation. The correct option is 1.
What is adaptation?"The process by which a species or organism gradually becomes more acclimated to its environment is defined as adaptation."
Adaption refers to an animal's behavioural or physical characteristics that aid in its survival in its ecosystem.
Because a region's abiotic factors change slowly, adaptation takes time. Those organisms that cannot adapt to these changes die, leaving only those that have.
Slow changes allow living things time to adapt through the evolutionary process over many generations.
Fast changes usually do not give living things enough time to adapt, forcing them to either relocate or become extinct.
Thus, the correct option is 1.
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Your question seems incomplete, the probable complete question is:
Why are rapidly occurring environmental changes more likely to cause extinctions than slowly occurring changes?
Slow changes allow time for adaptation.Rapid changes require little adaptation.Slow changes affect only small regions.Rapid changes have a global effect.Which of the following conditions is not based on the Hardy-Weinberg principle? Large population size No mutations Randomly mating populations Selective breeding
Selective Breeding
Explanation:
Hardy Weinberg principle saying that under certain conditions, the genotype frequency and the allele frequency will remain constant in a sexually reproducing population over a generation. If this principle is true, then he is saying that evolution must be stopped at some point in life. The conditions which maintain his principle are no gene flow, random mating, no mutation, no natural selection, and large population size. So, small population, natural selection, nonrandom mating, mutation, will disrupt Hard-Weinberg. equilibrium.Identify and explain the functions of each numbered plant organ in the diagram.
1.flower,2.leaf,3.stem,4.roots
Plant organs include roots, stems, leaves, and reproductive parts. Roots absorb water and nutrients, stems transport and support, and leaves conduct photosynthesis. Modifications to these organs help plants adapt to their environments.
Explanation:Plant Organ Functions and Modifications
In biology, understanding the functions of different plant organs is essential for grasping how plants live, grow, and interact with their environment. The four main plant organs include roots, stems, leaves, and reproductive organs. Roots are responsible for anchoring the plant and absorbing water and nutrients from the soil, while stems provide support and transport these resources to other parts of the plant. Leaves are the primary sites of photosynthesis, where light energy is converted into chemical energy. Reproductive organs such as flowers, fruits, and seeds are key to plant sexual reproduction and the spread of the species.
Different plant adaptations may lead to modifications of these organs, such as changes in the leaf structure to reduce water loss or root modifications to better store nutrients. When identifying organ modifications in a diagram, it's useful to assign a color for each type of organ using a key and then apply these colors accordingly.
To study the structure of leaves in detail, diagrams often highlight the different tissues including the mesophyll, veins, and epidermis, all of which contribute to the leaf's ability to make food. Drawing a simplified diagram of a mesophytic leaf cross section, for example, can serve as an easy reference for identifying and understanding each tissue's function.
The moon’s _______affects the oceans’
tides on Earth. fill in the blank
Answer:
Gravitational pull
cause it Generates tidal force
the level of cyclins in a cell increases during the M phase of the cell cycle what might happen to a cell if no cyclins were present during the M phase
Answer:
If cyclins were not present in phase M of the cell cycle, cell division would not be possible, since that phase could not be initiated.
Explanation:
Cyclins are regulatory proteins within the cell cycle and, specifically in phase M, are responsible for causing the nucleus to lose its nuclear envelope and heterochromatin condenses to form chromosomes.
During the cell division phase (phase M) the M-cyclins are the initiators of the events that initiate this process. To that end, they must bind to inactive enzymes, Cyclin-dependent kinases (CDKs), and activate them.
M-cyclins remain inactive in other phases of the cell cycle, inhibited by inhibitory protein factors that keep them phosphorylated. Phosphatases enzymes eliminate phosphorylation of cyclines, increasing their levels within the cell. Once active, kinases activate CDKs, and phase M begins.
If M cyclins were not present, or it was not possible to dephosphorylate them, the M phase of the cell cycle could not be initiated.
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If no cyclins were present during the M phase, then the cell cannot progress through the cell cycle.
The cell cycle can be divided into interphase where DNA replication occurs and a mitotic (M) phase, where cell division occurs.Cyclins are proteins that control the progression through the cell cycle.During specific restriction points of the cell cycle, cyclins interact with Cyclin-dependent kinase (CDKs), thereby activating them to produce functional enzymes that phosphorylate target proteins during the progression of the cell cycle.In conclusion, if no cyclins were present during the M phase, then the cell cannot progress through the cell cycle.
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Question 1 (1 point)
What is the term that scientists use when comparing the properties of solids, liquids and gases?
Explanation:
It is a distinct form of a matter in which it exist.There are 4 type matter that are exist in 4 different state.The states are- Solid, Liquid, Gas and plasma.These are also called as the 4 fundamental state.PLEASE HELP!! im despratte
Answer:
Template strand = complementary strand
GCA AG = CGT TC
TTA CG = AAT GC
GAT AC = CTA TG
CGG AT = GCC TA
DNA strand = mRNA strand
CGA TT = GCU AA
GCT TA = CGA AU
GCA TC = CGU AG
TTC AT = AAG UA
It is more important for DNA replication to be exact than transcription or translation because any error that occurs during DNA replication if not repaired will become permanent and will be transferred to the next generation.
Explanation: In DNA base pairing, G pairs with C and T pairs with A. But in RNA base pairing, G pairs with C and U pairs with A. DNA contains four bases G, C, T and A while RNA contains four bases G, C, A and U.
See the attached file
is this population in hardy-weinberg equilibrium
Yes, the hardy-Weinberg equilibrium deals about the population and stuff
Explanation:
Definition:
Hardly Weinberg principle is also known as Hardly Wein-berg equilibriumIn simple terms, Hardy Weinberg equilibrium can be stated as the genetic variation in a family will always remain constant from one generation to the next generation during the absence of disturbing influencesFormula:
The Hardly Weinberg equation is represented in the form of,
p2 + 2pq + q2 = 1
where,
p2 denotes the statistics of AA (homozygous dominant)
2pq denotes the statistics of Aa (heterozygous)
q2 r denotes the statistics of aa (homozygous recessive)
Conditions for Hardly Weinberg Principle:
The condition for the Hardly Weinberg conditions are listed below here,
1.No gene flow
2.No natural selection
3.Random Mating
4.large population size
5.no mutation
Answer:
its no
Explanation:
What do you think is bigger- cells or atoms and what is your supporting evidence?
cells are bigger then atoms
Explain how high blood cholesterol develops in someone with a genetic disorder versus someone who eats a high-fat diet
Answer:
Cholesterol can be described as the organic, fat-like steroid which is found in cells of an organisms body.
A person with a genetic disorder for high blood cholesterol will inherit the trait in a genetic manner from his family. He will have genes which allow for high levels of cholesterol to be produced in the body.
On the other hand, a person who eats a high- fat diet will have high levels of cholesterol due to his diet. He will not carry the disorder from his family and will neither pass on the high cholesterol situation in his offsprings.
In the 1600's, Robert Hooke, and English scientist, used a crude microscope to examine bits of cork. Cork is derived from the bark layer of certain trees. Upon seeing the cork under the microscope, Hooke named the spaces within the cork 'cells', because they looked like empty rooms of a monastery. Although he coined the term cell, an ironic feature of cork is that it is dead plant material. Knowing this, what feature of cells would Robert Hooke NOT have been able to observe under the microscope while looking at cork?
Answer: In other word the other person was saying Robert Hooke was the one who said the cork looked like cells
Explanation: The answer is Hooke
What are Three macromolecules that can be used as an energy source?
Answer:
There are four major classes of biological macro-molecules (carbohydrates, lipids, proteins, and nucleic acids); each is an important cell component and performs a wide array of functions
Explanation:
Which are characteristics of leeches? Check all that apply.
They are parasitic.
They are a type of roundworm.
They have setae.
They have medical uses.
They are segmented.
Answer:
They are parasitic.
They are not a roundworm.
Leeches lack setae.
Yes they do have medical uses.
Yes leeches are segmented.
Sorry if I am wrong
They are parasitic.
They are a type of roundworm.
They have medical uses.
are all correct
please can someone help? Questions attached :)
Answer:
c) 1.05 hours
d) 35%
Explanation:
c) You answer is correct. Cell division takes 5% of the total time, and the total time is 21 hours. 5% of 21 is
[tex]\frac{21}{100}[/tex] x 5 = 1.05 hours, which is the same as 63 minutes or 1 hour and 3 minutes.
d) Each marker represents 5% of the time (there are 20 markers in the whole circle). DNA copying is spread over 7 sections. Therefore, 7 x 5% = 35% time spent copying DNA
Which statement describes the light reaction of photosynthesis?
O
Carbon dioxide is put together with glucose.
O
Water molecules are split apart.
O
Air and water create energy for a plant.
O Water molecules are combined to make food.
Answer:
The correct option is B) Water molecules are split apart.
Explanation:
Photosynthesis can be described as a process in which plants make glucose and oxygen from carbon dioxide and water in the presence of sunlight. There are two main types of reactions occurring during this process which are known as the light reactions and the dark reactions.
During the light reactions, energy from the sun is used to drive electrons from the water molecule. ATP and NADPH molecules are generated temporarily which are used during the dark reactions.
Final answer:
Water molecules are split apart. The light reaction of photosynthesis splits water molecules apart, a process energized by sunlight captured by chlorophyll, which also results in the production of oxygen, protons, and electrons.
Explanation:
The correct statement that describes the light reaction of photosynthesis is: Water molecules are split apart.
In the light-dependent reactions, chlorophyll absorbs energy from sunlight, which is then used to convert water (H₂O) into oxygen (O₂), protons, and electrons. This occurs when water molecules are split apart, a process also known as photolysis. This stage of photosynthesis is crucial for the plant's subsequent production of glucose.
The overall equation for photosynthesis is 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. However, only the first half-reaction involves the light-dependent reactions where water is split to release oxygen and provide the necessary electrons and protons for the later stages of photosynthesis.
What is one disadvantage of desalination?
The process kills fish.
The process uses fuel that is expensive.
The process makes water that is unsafe to drink.
The process is too difficult to carry out in big cities.
Answer:
A It kills fish
Explanation:
We can see here that the disadvantage of desalination is B. "The process uses fuel that is expensive."
What is desalination?Desalination is the process of removing salt and other impurities from seawater or brackish water to produce fresh water suitable for various purposes, including drinking, irrigation, and industrial use. While desalination has benefits in addressing water scarcity, it is not without drawbacks.
One significant disadvantage is the high energy requirement for desalination processes. Most desalination methods, such as reverse osmosis and thermal distillation, rely on energy sources like electricity or fossil fuels to power the equipment and processes involved. The use of fuel, particularly when derived from non-renewable sources, can be costly, both economically and environmentally.
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Identify the structures and
functions of the male and
female reproductive systems.
Answer AND Explanation:
MALES
Testes: they are oval shaped structures that produce the male gametes and sex hormone called testosterone.
Seminiferous tubules: tubules where spermatogenesis occurs.
Vas deferens: are tubules which lead to the epididymis.
Epididymis: is along, coiled tube for storage of sperms. it contraction and relaxation pushes sperms out and allows ejaculation through the urethra.
Accessory glands like the seminal vesicles, cowper's gland and prostate gland produce seminal fluid that provides a nutrient medium for sperms to swim in.
Scrotum: contains the testes outside the body.
FEMALES
Ovary: these are oval-shaped structures that produce female gametes and sex hormones.
Oviduct: these are hollow structures with an expanded funnel-shaped opening which accepts the released ovum and directs it to the fallopian tube. Fertilization takes place in the oviduct forming zygote.
Uterus: has an inner layer called endometrium which becomes folded and vascularised to allow implantation. The endometrium nourishes the embryo..
Cervix: is a muscular ring between the uterus and the vagina. It secretes a plug of mucus, which prevents entry of pathogens and air
The vagina is a muscular copulatory canal into which penis enters. Vagina also allows passage of foetus during parturition.
How do the chromosomes in most cells of an organism, such as the leaf cells of a plant, compare to the chromosomes in its reproductive cells, which are sperm and egg cells?
Answer:
The chromosomes in all the cells of the body, except for the sex cells, are diploid in number. The somatic cells divide by the process of mitosis.
The chromosomes in the sex cells are haploid and divide by the process of meiosis. This is because when an egg cell and a sperm cell will join, then each half of the chromosomes present in both the cells will pair up to maintain the chromosome number of the species.
There are conflicting opinions about the use of gm crops. Imagine this scenario: today we are faced with diseases we have never had to combat before; HIV-AIDS, ebola. Imagine our agricultural corn crops are hit by a similar virulent pathogen; one that attacks members of the Zea species. Given the history of corn in the Western Hemisphere what would be the best strategy for survival of the Zea species?
A) Conduct research and find a way to kill the pathogen
B) Decrease the gene variation in favor of more GM corn-varieties
C) Increase genetic variation and breed plants to contain the wild variety
D) Conduct research to find a natural predator of the disease-causing pathogen.
Answer:
first off i love your pfp and the answer is D
Explanation:
The best strategy for the survival of the Zea species if our agricultural corn crops are hit by a virulent pathogen is option C, to increase genetic variation and breed plants to contain the wild variety. This approach maximizes the genetic diversity within the species, potentially leading to natural resistance to new pathogens.
Explanation:The question 'What would be the best strategy for survival of the Zea species, if our agricultural corn crops are hit by a virulent pathogen?' involves considering the consequences and benefits of different strategies to protect the species from disease.
The best option is likely C) Increase genetic variation and breed plants to contain the wild variety. This strategy could help in developing resistance to the pathogen by maximizing the genetic diversity within the Zea species.
Genetically modified organisms (GMOs) have been used, for example, to create GM crops like corn that are resistant to diseases and pests. However, monocultures and decreased genetic variation can make crops more susceptible to pathogens. Increasing genetic variation inherently provides a greater probability that some plants will have resistance to new pests and diseases, safeguarding the food supply and biodiversity.
While the other options may also be part of an integrated approach to disease management, increasing genetic variation is a fundamental strategy that echoes the natural evolutionary arms race between plants and their pathogens.
How is sunlight the primary source of energy for your own life?
What is capillary action? Give examples
Answer:capillary action.
It is the ability of a liquid to flow in a narrow container without the force of gravity. It is aided by adhesive and cohesive force between the liquid medium.
Explanation:example: Tears draining from the eyes, movement of ink to the tip of the pen.
Capillary action is the movement of a liquid within a narrow tube due to the balance of cohesive and adhesive forces. This natural phenomenon facilitates the absorption of water and nutrients in plants and is also used in medical tests to draw small amounts of blood into capillary tubes.
Explanation:Capillary action is the phenomenon where a liquid moves up a narrow tube against the force of gravity. This movement is the result of the balance between cohesive forces, which are the forces that keep the liquid molecules together, and adhesive forces, which are the attractions between the liquid molecules and the surface of the tube.
In nature, capillary action is crucial for the movement of water from the soil into the roots of plants via the xylem tubes. In medicine, capillary action is exploited for drawing small amounts of blood during medical tests.
Examples of capillary action include the movement of water in thin tubes, the process of water and nutrients absorption in plants, and the wicking of fluids in paper or cloth. An everyday example is ink rising in the nib of a fountain pen or the absorption of water by a towel.
Capillary Action in Everyday Life and Biomedical Applications
In everyday life, we observe capillary action when a sponge absorbs water or when a paper towel picks up a spill. Biomedical applications of capillary action are particularly notable in medical testing—such as glucose testing for diabetics—where blood is drawn into a narrow glass tube by this phenomenon.
A researcher incubates a cell with radiolabeled amino acids. These amino acids are incorporated into the proteins as they are synthesized by the cell. Select which piece of data would indicate the incorporation of radiolabeled amino acids during protein synthesis? A) Radioactivity levels would increase first at the nucleus, followed by the Golgi, and then the cell membrane. B) Radioactivity levels would increase first at the nucleus, followed by the ribosomes, and then the secretory vesicles. C) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles. D) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the nucleus, and then the secretory vesicles.
Answer:
During an investigation, the addition of radiolabeled amino acids during protein synthesis occurs when the data shows high levels of radiation in protein synthesis, packaging and transport, which is equivalent to saying that radioactivity levels would first increase in the rough endoplasmic reticulum, followed by the Golgi and then the secretory vesicles (option C).
Explanation:
Protein synthesis in the cell is a process that involves the formation of polypeptide chains with the successive incorporation of amino acids.
RNA, which contains the sequence of triplets or codons that form the genetic code, is coupled to the ribosomes. Each codon or triplet consists of three nucleotides and encodes specific amino acids.
The RNA chain contains a specific nucleotide sequence and determines the assembly of amino acids to a polypeptide chain, by the action of ribosomes present in the rough endoplasmic reticulum.
In the Golgi apparatus, the proteins formed are conjugated, with the addition of carbohydrates or lipids, and arranged in secretory vesicles for transport.
In these steps, where the labeled amino acids are present, the levels of radioactivity would increase in the rough endoplasmic reticulum, the Golgi apparatus and the secretory vesicles.
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Answer:
the answer is c
Explanation:
Geographic isolation may result in
Land plants are divided into two main groups. They are ________________ and _______________.
Answer:
Land plants are divided into two main groups. They are Mesophytes and Xerophytes
Explanation:
Xerophytes are types of plants that lives on dry habitat while Mesophytes are plants that lives on conditions that are optimal on dry land for growth.
Answer:
vascular; nonvascular
Explanation:
i just did it and got it right so yea
Large quantities of solid water are stored in the ___
Answer:
Ice sheets
Explanation:
Water is stored in solid, frozen form in ice sheets and glaciers, and in snowpack at high elevations or near Earth's poles.
Which event is the most likely cause for the four periods when punctuated equilibrium seems to have occurred?
aated
meteorite bombardment
stasis
mass extinction
global warming
um
Answer:
The correct answer is : Stasis.
Explanation:
Puntuated Equilibrium is an evolutionary phenomenon in which the species undergo two different types of phases,Stasis (slow) : This is the period when evolutionary change occurs very slowly in the species. The species accumulate mutations at random now. However, the effects of the mutations are are not so influential that it would cause drastic evolutionary change in the species.Speciation (rapid) : Due to the accumulation of multiple mutations in the stasis period, some of the individuals belonging to the species develop certain phenotypes that are beneficial to them. These individuals with distinctly different phenotypes with respect to the other individuals can develop into a new species.Answer:
global warming
Explanation:
gradpoint