An example is the drop of white-colored moths and an increase in dark-colored moths in London after the industrial revolution. Because darker-colored moths could camouflage well in the sooty environment (due to industrial emissions), they were preyed less by their predators. White-colored moths stood out and due to being preyed more their numbers declined over generations – because they wouldn’t survive long enough to reproduce and pass their genes to the next generation. The predominant color for the moths’ population became dark color.
Environmental factors such as ultraviolet (UV) light can significantly influence the expression of genes related to skin color in humans, leading to changes in melanin production and resulting in a darker pigment as an adaptive response.
Explanation:Effects of Environment on Phenotype
Environmental factors play a crucial role in the expression of genotypes in organisms, influencing phenotypes across various species. A clear example of this is seen in the variable pigmentation of human skin. While skin color is determined by multiple genes, the exposure to environmental elements like sunlight can markedly alter pigmentation levels. Specifically, exposure to ultraviolet (UV) light signals melanocytes in the skin to increase the production of melanin, leading to a darker complexion. This is a direct instance where an environmental stimulus affects gene expression, altering the phenotype.
In simple terms, while our genes provide the blueprint for traits such as skin color, the environment in which we live can impact how these genes are 'read' and 'acted upon' by the body. This results in the phenotypic variations we observe, not only in humans but across a wide range of organisms. Consequently, identical genetic information can lead to diverse phenotypes under different environmental conditions.
What happens during S phase?
O
A. Chromosomes are duplicated.
O
B. The cell splits in two.
O
C. DNA separates into two nuclei.
O
D. Cytoplasm is manufactured.
Answer:
chromosones are duplicated just took test
Explanation:
Chromosomes are duplicated during the S phase of the cell cycle. Therefore, the correct statement is option A.
What is the S phase of the cell cycle?S phase, or the synthesis phase, is the second phase of interphase in the cell cycle. During this phase, the cell undergoes DNA replication, where chromosomes also get duplicated. Each chromosome consists of two identical chromatids connected by a centromere.
The process of DNA replication during the S phase involves the use of several enzymes and proteins. The process starts with the unwinding of the DNA double helix structure by the helicase enzyme creating a replication fork to which DNA polymerase enzymes attach and starts the replication process by copying the template strands of DNA.
As the polymerase moves along the template strand, the enzyme adds complementary nucleotides to create a complementary strand of DNA. Each nucleotide before adding is checked by proofreading enzymes to ensure the new DNA strand is error-free.
Therefore, chromosomes are duplicated during the S phase.
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what is a plant root an example of
Answer:
Someone else answered it, but a plant root is a example of a a plant that typically lies below the surface of the soil.
Explanation:
Plant roots are integral to a plant's ability to absorb nutrients, provide structural support, store food, and sometimes propagate asexually. The tap root system, such as that of a carrot, features a main root with secondary roots, whereas a fibrous root system, like that of grasses, consists of a dense network of roots.
A plant root is an example of an organ in plants that plays a crucial role in water and nutrient absorption, anchorage, and sometimes storage and asexual reproduction. Dandelion, with its tap root, serves as a common example of a plant that utilizes its root system for these purposes. Roots can be specialized to perform additional functions such as the bulbous roots storing starch, the taproots of carrots, turnips, and beets being modified for food storage, and roots involved in asexual reproduction like the poplar and aspen trees that form clones from their roots.
There are two primary types of root systems: the tap root system and the fibrous root system. The tap root system consists of one main root, as seen in a plant like a carrot, whereas a fibrous root system, which can be found in grasses such as wheat, rice, and corn, has a dense network of roots closer to the soil surface. The former is typically found in dicots whereas the latter is often seen in monocots.
Which of the following is an effect of forest fires on the atmosphere? A. a decrease in water vapor B. an increase in oxygen gas C. a decrease in nitrogen gas or D. An increase in carbon dioxide
Answer:
D
Explanation:
combustion increases carbondioxide co in the armosphere
Answer:
D. An increase in carbon dioxide
Explanation:
An effect of forest fires on the atmosphere is an increase in carbon dioxide.
These type of forest fires are the most dangerous.
Which of these is an advantage of wind energy?
A. It reduces bird and bat populations.
B. It generates noise pollution.
c. It generates electricity.
D. It increases greenhouse gas emissions.
Answer:
C
Explanation:
Wind power from for example a windmill does not create greenhouse gasses nor does it make alot of noise but by spinning does create electricity.
The advantage of wind energy is that it generates electricity. Thus, the correct option is C.
What is Wind energy?Wind power or wind energy is one of the most important use of wind turbines to generate electricity. Wind power is a popular, sustainable, renewable energy source which has a much smaller impact on the environment than that of burning fossil fuels.
Wind power contains zero carbon emission which is often associated with the operation of wind turbines. The loss for farmers or any other living beings does not occur, that is why the wind turbines use only a fraction of land area. It depends on the combustion of fossil fuels. Windmill does not pollute the air like a power plant does.
Therefore, the correct option is C.
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HELP!! The figure below shows ocean currents. Where will climate change slow the currents the most, causing colder temperatures, and why?
Answer:
Along the Kuroshio Current, because it is carrying water north towards melting ice caps
Explanation:
The ocean currents have the tendency to be faster when they are warmer, and to be slower when they are colder. The reason for this is that the warmer water is less dense, thus it can move more quickly, while the colder water is denser, thus heavier, so it moves slower. The Kuroshio Current moves from the lower latitudes toward the higher latitudes. As it does, this ocean current is becoming colder and colder as it gets closer to the higher latitudes, so it is becoming denser, heavier, and because of it slower. Another thing that will contribute to this current's slowing down are the melting ice caps because of the climate change, as they will make the water even colder, and the Kuroshio Current will come across this cold water, so it will decrease its speed significantly.
Which of the following monomers would be used to make the double helix of a DNA molecule?
The monomers that would be used to make the double helix of a DNA molecule are the phosphorus+ sugar+ base. The correct option is A.
What is DNA?DNA is a genetic material that is present in the nucleus of the cell. It is present in all plants and animals. This is the important material in the body that makes every individual unique.
DNA is made up of three substances. They are phosphorus sugar, which makes the backbone of the helix. The bases are present in between the helices, they are joined by hydrogen bonds.
There are two hydrogen bonds present between adenine and thymine. There are three hydrogen bonds present between guanine and cytosine. The bases keep the two helices together.
Thus, the correct option is A, phosphorus+ sugar+ base.
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What kinds of daily activity
can contribute pollution to Surface water
runoff or to the ground water sources desene
infiltration and recharge ? Describe two
activities and tell how these would contribute
pollution to water resources so
Answer:littering and sewage
Explanation:
Daily uncontrolled litter accumulate in water sources and most of this litter trap more waste and the daily release of sewage .
How doe the natural process of meiosis support evolution
Answer:
Meiosis is sexual reproduction, which involves two organisms mixing their genes together to produce new offspring.The more genetic variation there is within a population, the faster it will evolve
Explanation:
During Meiosis recombination occur which cause mixing of segments of chromosomes that can lead to variation.
Variation is the leading cause of evolution.What is variation?Variations arise due to mutation, recombination at the time of gamete formation or due to environmental factors.
Variations can be categorized into two types:
Genotypic variations are caused due to changes in the chromosome or genes or due to various alleles of the same gene. They are inheritable variations.What is evolution?Evolution is the change in heritable traits of biological populations over successive generations. Evolutionary processes give rise to diversity at every biological organization level. All life on earth shares a common ancestor known as the last universal ancestor.
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If a population has MORE environmental resistance than biotic potential, it will ______
A. Increase
B. Decrease
C. Remain stable
D. Sharply rise and fall
Answer:
B. Decrease
Explanation:
If a population has MORE environmental resistance than biotic potential, it will decrease.
If a population has more environmental resistance than biotic potential, it will decrease. So, the correct option is (B).
What is Environmental resistance?Environmental resistance is defined as the process in which some different elements or factors prevent the growth of the species uncontrollably where as nature does something to control the growth of the species in order to reduce the excessive growth of population or over population.
"Environmental resistance" is related in a similar way to some factor that limits not only the growth of a species but also the rate of reproduction. Availability of certain necessary resources is the factor of environmental resistance which are as follows:
FoodWaterPredationDiseasesCollection of toxic metabolic wasteBehavioral change in speciesThus, if a population has more environmental resistance than biotic potential, it will decrease. So, the correct option is (B).
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the eye of a hurricane has the
A. Most intense rainfall
B. Highest wind speeds
C. Highest air pressure
D. Warmest temperatures
Answer:
Well the eye is the most calm part of both a tornado and hurricane, so its D, Warmest temperatures :)
Hope this helped you :))
Answer:
highest wind speeds
Explanation:
the eye's temperature is usually normal for the most part. But thunder storms do occur also
List three possible challenges Darwin might have faced ?
Who is Darwin? Please be more specific.
Complete the phylogenetic tree by matching each characteristic that arose during the evolution of animals to its correct position. ( Start from top to bottom boxes)
OPTIONS:
Backbone
Tissues
Coelom
Segmentation
Endoskeleton
Answer:
The correct characteristics are - tissue, coelom, segmentation, endoskeleton, and backbone from top to bottom boxes.
Explanation:
This phylogenetic tree showing the evolution and relatedness of the different organisms on their shared characteristics. In the given phylogenetic tree there are some characters are missing and we can predict or state them on the basis of evolution and studying the characteristics.
After the Porifera phylum tissue-level organization is found in the organism hence Tissue would be placed in the first box.
The coelom is found organisms above the Nematoda level, which further include a character segmentation in Annelida and Arthropoda. Another lineage from arising with the coelom organism that included endoskelton and backbone.
Thus, The correct characteristics are - tissue, coelom, segmentation, endoskeleton, and backbone from top to bottom boxes.
Answer:
tissue, coelom, segmentation, endoskeleton, and backbone
Explanation:
_____ can produce their own food
Answer:
Autotrophs
Explanation:
Autotrophs can produce their own food.
Autotrophs are able to gather food from just their body and survive!
Why do some codons code for the same amino acid as another codon?
A. it is due to mutations.
B. There are only 20 amino acids and 64 possible combinations
C. Each codon is unique and they all code for different amino acids.
Answer:
it is B
Explanation:
I have answer this question once
Answer:
B. There are only 20 amino acids and 64 possible combinations
Explanation:
A codon is the combination of three nitrogenous bases, which encode an amino acid. Some codons encode the same amino acid as another codon, this is because there are only 20 amino acids and 64 possible combinations.
Amino acids, in turn, are the organic substances that form proteins that will be responsible for various functions in our body, such as structural, enzymatic, defense, transport and hormonal functions.
How is the reproductive system different from other
body systems?
Answer:
Most body systems are necessary to keep an individual alive.
Unlike other body systems, the reproductive system is not essential to keep an individual alive.
en 4
For the past 150 years there has been a major new input to the carbon cycle. What is it?
ed
out of
Select one:
O a. Increased animal farming has resulted in greater CO2 releases.
O
O
b. Changes in ocean currents have lead to the release of large quantities of CO2
c. Industrialization has resulted in the burning of fossil fuels such as oil and coal,
which releases CO2 into the atmosphere.
O
d. There are more humans releasing large quantities of CO2 as respiration.
Answer:
Industrialization has resulted in the burning of fossil fuels such as oil and coal,
which releases CO2 into the atmosphere.,
-c.
Answer:
c. Industrialization has resulted in the burning of fossil fuels such as oil and coal, which releases CO2 into the atmosphere.
Explanation:
For the past 150 years there has been a major new input to the carbon cycle, industrialization has resulted in the burning of fossil fuels such as oil and coal, which releases CO2 into the atmosphere.
How does transpiration pull work?
Answer:
transpiration pull –The loss of water through evaporation from the leaves must be replaces by water coming up the xylem. Water molecules are attracted to each other due to cohesion between them. These forces are strong enough to hold the molecules together in a long column.
Explanation:
Transpiration is the loss of water from the plant through evaporation at the leaf surface. It creates negative pressure (tension) at the leaf surface, causing water to be pulled up from the roots.
Explanation:Transpiration is the loss of water from the plant through evaporation at the leaf surface. It creates negative pressure (tension) at the leaf surface, causing water to be pulled up from the roots. This is known as the cohesion-tension theory of sap ascent. Water movement is driven by a difference in energy between the water in the soil and the water in the atmosphere.
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Why does diffusion not require any energy?
A. Random particle movement allows molecules to move from an area.
B. Molecules are moving from a lower to higher concentration.
C. The higher temperatures of the membrane "jump starts" diffusion.
D. Cells only use energy to move substances across the membrane.
Final answer:
Diffusion is an energy-free process because molecules naturally move down their concentration gradient due to their kinetic energy, ultimately leading to dynamic equilibrium.
Explanation:
Diffusion does not require energy because it is a passive process where molecules move from an area of higher concentration to an area of lower concentration. This movement is driven by the inherent kinetic energy of molecules and occurs until there is no net movement of molecules, a state known as dynamic equilibrium. Factors like temperature can influence the rate of diffusion, with higher temperatures increasing the rate as molecules move more quickly.
Final answer:
Diffusion is an energy-free process where molecules spread out from higher to lower concentration areas due to kinetic energy, moving down the concentration gradient in passive transport.
Explanation:
Diffusion does not require any energy because it is driven by the kinetic energy that is inherent to all molecules and atoms due to their constant random motion. This movement is a result of the molecules spreading out from an area of higher concentration to one of lower concentration to reach equilibrium, a process known as moving down the concentration gradient. This form of movement, where molecules spread out evenly without the use of energy, is known as passive transport. Molecules continue to move randomly after reaching dynamic equilibrium, but there is no net movement from one area to another as concentrations are equal.
How long should warm-up and cool-down activities take? Question 10 options: 30 minutes each 2 to 3 minutes each 5 to 10 minutes each 15 to 20 minutes each
Answer:
The correct answer would be option C, 5 to 10 minutes.
Explanation:
Warm up and cool down are the two periods in the exercise that have to be included when you do a workout. Warm up is the starting exercises of mild intensity in which the body prepares itself for the upcoming intense workout. Some simple exercises are done before starting the regular exercise. Warm up may include mild jumping, mild jumping jacks, etc. Warm up basically increases the blood flow to the muscles and prepare the muscles for the intense workout session. On the other hand, cool down is done after completing the regular intense workout session in order to relax the muscles of the body. Cool down may include mild walking or some stretches to relax the body muscles. Both warm up and cool down take 5 to 10 minutes each.
Answer:
The correct answer is "5 to 10 minutes each".
Explanation:
Warm-up and cool-down are activities that are essential to start and finish an exercise routine respectively, but usually are not considered part of the routine because they should not take too much time. According to fitness professionals, warm-up and cool-down activities should take 5 to 10 minutes each, where the longer the exercise routine the longer these activities should last.
which of the following is NOT a function of the excretory system
A. Filter Body Fluids
B. Collect Water
C. Eliminate Body Waste
D. None of the above
Answer:
B. Collect Water
Explanation:
Collecting Water is NOT a function of the excretory system.
Why is alchemy no longer accepted?
O
A. Alchemy became less popular once Aristotle died.
O
B. The discovery of radioactivity took people's attention away from
alchemy.
O
C. Alchemists were not able to turn other metals into gold.
D. Scientists used evidence, analysis, and experiments to disprove
alchemy.
SUBMIT
Answer:
The correct answer is D. Scientists used evidence, analysis, and experiments to disprove alchemy.
Explanation:
Alchemy was based on changing a non-precious material into a precious material like lead into gold. It was considered as magic and science before the 19th century because in the 19th-century scientist get to know about the nature of metals and the periodic table that disproved alchemy.
Alchemist said that everything is made up of soil, water, fire, and earth but after the advancement of chemistry and physics it became clear that everything is made up of atoms, and lead is also made up of atom which can not be converted into gold.
So scientist used evidence, analysis, and experiments to disprove alchemy. Therefore the correct answer is D.
What about cellouse makes it ideal for structural support
Due to the strong intermolecular force of attraction in cellulose it provides high strength and support.
Explanation:Cellulose is a significant polysaccharide since it is the most copious natural compound on Earth. Cellulose is a significant segment of intense cell dividers that encompass plant cells, and it's what makes plant stems, leaves, and branches so solid. It absolutely takes a ton of effort to cause damage to the structure of cellulose.
Cellulose particles are arranged parallel to one another and are combined with hydrogen bonds. This structures long, link like structures, which join with other cellulose atoms and is the thing that produces such a solid help structure.
Which of the following describes an antibiotic that is good for a human to take as a medicine?
A. The antibiotic kills harmful bacteria but not human cells.
B. The antibiotic is a harmful substance called a toxin.
C. The antibiotic kills all living things, including bacteria and human cells.
D. The antibiotic provides food molecules that are needed for good health.
Answer:
The correct answer would be option A, The antibiotic kills harmful bacteria but not human cells.
Explanation:
Antibiotics are the medicines given to a person who gets sick due to a bacterial infection in his body. Bacterial Infection can not be treated without using the antibiotic medicines because antibiotics are the only medicines that kill the harmful bacteria inside a human body while keeping the human cells alive and healthy. Antibiotics do not harm the body cells. They just work on the bacterial infection and kill the bacteria. Other functions of the body are not disturbed by taking the antibiotics.
Match the terms to their definition. 1. dominant a gene or trait that is masked when a dominant gene is present 2. genotype a gene or trait that always expresses itself 3. hybrid an organism with one dominant gene and one recessive gene 4. phenotype the genes present in a specific trait 5. recessive the expression of a trait, or what the trait looks like
Answer:
1. recessive
2. phenotype
3. hybrid
4. genotype
5. dominant
Explanation:
1. recessive is the one that is being masked when a dominant trait is present in Law of Dominance
2. Phenotype is the gene or trait that expresses itself
3. Hybrid or heterozygous consists of an a dominant gene
example: Purple is dominant over white flowered pea plant
Y- purple y-white
Yy is the hybrid/ heterozygous pea plant because Y(purple) is dominant over y(white).
4. genotype refers to presence of the specific trait / the exact pairing of alleles.
example: YY, Yy and Yy
5. Dominant, expression of a trait and what it looks like.
example: Yy is a heterozygous or a hybrid plant. since Y is dominant over y then the looks of the plant will have a higher probability in resulting in to purple flowered pea plant.
In biology, the terms dominant, genotype, hybrid, phenotype, and recessive are related to genes and traits.
Explanation:1. dominant: A gene or trait that is masked when a dominant gene is present.
2. genotype: The genes present in a specific trait.
3. hybrid: An organism with one dominant gene and one recessive gene.
4. phenotype: The expression of a trait, or what the trait looks like.
5. recessive: A gene or trait that always expresses itself.
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Which brain structure is identified by the arrow in the figure?
A. Cerebellum
B. Medulla
C. Pons
D. Corpus callosum
Answer:
Cerebellum
Explanation:
Answer:
Option A, Cerebellum
Explanation:
The portion of brain highlighted in this image is cerebellum. A cerebellum is located just behind the top part of the brain stem. Also at the location of cerebellum, the spinal cord meets with the brain. The cerebellum consists of two half parts known as hemisphere. The major function of cerebellum includes receiving of information from nervous system, spinal cord and other brain parts and regulating motor movements.
Hence, Option A is correct
In cellular respiration, stored chemical energy in (2 points)
Question 3 options:
1)
ATP and NADH is converted to carbohydrate molecules
2)
ATP molecules is used to build NADH molecule
3)
organic molecules is converted to ATP molecules
4)
food is used to make organic molecules like glucose
Answer:
In cellular respiration, stored chemical energy in organic molecules is converted to ATP molecules- 3)
ANSWER:
The correct option is C- Organic molecules are converted to "ATP molecules".
EXPLANATION:
Cellular respiration is the process that provides energy for the important life processes. Cellular respiration is essential for all living organisms and therefor all living cells must carry out this process. In this respiration, ATP is released which is essentially energy needed for all life processes of an organism. Cellular respiration can be aerobic when it takes place in the "presence of oxygen" or it can be anaerobic i.e. respiration takes place without the presence of oxygen.What part of the cell membrane is not mix with water
which molecule is used up in photosynthesis?
Final answer:
During photosynthesis, carbon dioxide, water, and solar energy are used to produce glucose and oxygen. ATP is generated during the light-dependent reactions and is vital for the subsequent synthesis of glucose in the Calvin cycle.
Explanation:
The molecule used up in photosynthesis includes carbon dioxide (CO2), water (H2O), and also relies on solar energy to drive the reactions. During the light-dependent reactions of photosynthesis, ATP (adenosine triphosphate) is created, which along with NADPH, is used in the Calvin cycle to fix carbon dioxide, producing glucose. The overall chemical equation representing this biochemical process is 6CO2 + 6H2O → C6H12O6 + 6O2.
The ATP and NADPH generated are crucial for the synthesis of glucose in the process, which works coherently with sunlight absorbed by chlorophyll to facilitate the production of energy-rich sugar molecules. It is important to understand that the glucose produced from photosynthesis is an energy storage molecule and is later used by organisms to produce ATP through cellular respiration.
Answer: water and carbon dioxide
Explanation: yes
Suggest reasons for using synthetic forms of drugs rather than using plant extracts directly
Answer:
they lead to quick recovery
Explanation:
they contain chemicals made by professionals which lead to quick recovery
Synthetic drugs offer consistent dosages, reliable supply, and are often more potent with fewer side effects than natural plant extracts. They also contribute to lower toxicity in both human health and the environment.
The use of synthetic forms of drugs rather than plant extracts directly has several advantages. Primarily, it allows for consistent dosages and purities, which are crucial for ensuring the efficacy and safety of medications. Furthermore, because some medicinal plants are limited in availability and can be affected by environmental factors, synthesizing medications offers a reliable supply avoiding shortages and high costs associated with plant-based sources. Percy Julian's work in mass producing drugs such as cortisone and hydrocortisone stands as a testament to the success of such an approach. The synthesis process can also lead to drugs that are more potent, require lower dosages, and have fewer side effects compared to their natural counterparts. Moreover, synthetic methods can minimize the toxicity to human health and the environment.
Describe ways that water pollution occurs.
Answer:
water pollution is also one the major problem now due to over population n other thing
Explanation:
When some one throw waste in water then there is plastic also and other waste which contain different harmful chemical and directly mixed with water and pollute the water.
Water pollution is caused by contaminants entering water bodies, which can have detrimental effects on ecosystems and human health due to various pollutants. Eutrophication and oxygen-demanding waste are key factors contributing to water pollution.
Water pollution occurs through various means, including point source pollution (from a single site) and nonpoint source pollution (from multiple dispersed sites). Contaminants like chemicals, biological pathogens, and physical waste can lead to harmful effects on aquatic ecosystems and human health. Factors like eutrophication and oxygen-demanding waste contribute to water pollution, impacting water quality and organisms.