Which of the following is an example of a keystone species? (select all that 2 points
apply) *
Beavers: Beavers are considered habitat engineers because they change the
environment by building dams. This dam building provides still water in which many
species flourish.
Mountain Lions: These predators cover large areas and influence many species. Their
prey will alter where they eat and live because of the mountain lion. Scavengers are
also affected by the mountain lion's activity.
Bees: By pollinating plants, bees contribute to their survival. The plants are shelter for
insects, which are then eaten by other species, like birds.
Wolves: Being a top predator, wolves are important in many habitats. Wolves keep
deer populations in check and too many deer will eat small trees, which leads to fewer
trees. In turn, there would be fewer birds and beavers and the whole ecosystem would
change.
Keystone species control the dynamic of communities and ecosystemic structure. All the provided options are examples of keystone species.
What is a keystone species?Keystone species are organisms that play a significant role in the population's dynamics. If removed, there would be catastrophic effects on the ecosystem.
Keystone species can,
Control the size of other species' populationsModify a community structureExert an up-down effect at lower trophic levels. In this way, they provide essential resources.Prevent dominant species from monopolizing ecosystems.
Identifying keystone species turn out to be highly used to recover degraded ecosystems.
There are four main types of keystone species. These are,
Predators. Top predators, like mountain lions and wolves, control all other species in the trophic chain, even plant species. For instance, they control herbivore species and impede them to over-predate on plant species.Mutualists. These species benefit other species by being associated. For instance, many plant species depend on bees to pollinate them and get to reproduce. Many animal species and man depends on bees to get a source of food.
Ecosystemic engineers. These species modify the environment and cause changes in the whole ecosystem. This is the case of beavers that cut down trees to construct their shelters modifying the area and affecting other forms of life.Herbivores. They feed on plants and get to control their population sizes. Depending on the type of plants they feed on, they can affect positively or negatively the ecosystems.
All the provided options are examples of keystone species.
Beavers are ecosystemic engineersMountain Lions are top predatorsBees are mutualistsWolves are top predatorsYou can learn more about keystone species at
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introns are deleted before a gene is transcribed from DNA to mRNA?
Introns are deleted before a gene is transcribed from DNA to RNA because introns are non coding regions between exons their presence will interrupt the translation process.
Explanation:
Introns are the non coding regions on mRNA that are transcribed from a sequence of DNA. The introns are deleted by RNA splicing and only exons are coded so that correct protein is formed otherwise introns would get coded along and wrong protein will be formed. Introns are present in eukaryotic cell.
Introns play a very important role in controlling gene expression. Multiple variant of a particular protein is controlled by introns. An error during splicing would cause a different protein to be code.
Introns are important because all the cells in eukaryotes have same group of genes and to prevent them in getting expressed in all the cells where they are not required.
Why do you think Linnaeus did not include classification kingdoms for categories of archaea and bacteria?
Answer: Linneaus used the question is it Animal Mineral or plant to classify? Even though Leeuwenhoek had discovered bacteria it wasn't really known that thats what they were. Archaea was definitely not discovered until much later
Explanation:
The Linnaean classification system was given in 1700s and it is based on similarities in obvious physical traits such as for plant and animal kingdom.
Bacteria and archaea were not discovered at that time.
The Linnaean classification systemThis classification system was given by Carolus Linnaeus in 1700s.
It consists of a hierarchy of grouping called taxa. Taxa ranges from kingdom to species.
Kingdom was the broadest and most inclusive grouping. This classification is based on similarities in physical properties.
At that time archaea and bacteria were not discovered and the three domain classification system was given later by Carl Woese in 1990.
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1. A stem cell in an animal divides by mitosis.
Which statement is true about the two daughter
cells?
A. They each have identical functions.
B. They each have the same DNA sequences.
C. They are the same size and shape as their paren
cell.
D. They each have half as many chromosomes as
their parent cell.
how can you determine a phenotypic ratio?
Answer:
i believe a punnett square would do that
Explanation:
To determine a phenotypic ratio, count the number of offspring showing each phenotype and then simplify these counts to the smallest whole number ratio. This ratio reflects the expression of dominant and recessive alleles.
To determine a phenotypic ratio, you need to look at the visible characteristics of the offspring from a genetic cross. These characteristics are influenced by alleles, with capital letters representing dominant alleles and lowercase letters representing recessive alleles. For example, if you observe the following plant phenotypes in the F₂ generation: 2706 tall/inflated, 930 tall/constricted, 888 dwarf/inflated, and 300 dwarf/constricted, you would reduce these numbers to the simplest whole number ratio to get the phenotypic ratio. This helps us understand if the results are consistent with Mendelian principles, such as the expected 9:3:3:1 ratio for a dihybrid cross.
On the other hand, genotypic ratios are about the gene combinations in the offspring, which may not always be visibly distinguishable.
How does the cell move materials across its membrane in order to keep its internal environment constant?
Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane
Various materials move across the cell membrane via diffusion in order to keep its internal environment constant. Cell transport can be energy-dependent or energy independent.
What is Cell transport?Cell transport is the movement of materials across the plasma membrane. Cell transport includes two types of transport such as passive and active transport. Passive mode of transport does not require energy whereas active mode of transport requires energy (ATP) to proceed the movement of molecules. Passive transport proceeds through diffusion, facilitated diffusion and osmosis.
Diffusion is the movement of materials across the plasma membrane from the region of their high concentration to the region of low concentration. This movement does not require energy as concentration gradient favors the movement of molecules.
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1. Absolute ages are based on evidence from
a. key beds.
b. stratigraphy
c. index fossils.
d. radiometric dating.
What evidence did Darwin use to support his theory of evolution? Check all that apply.
Answer: Please clarify the answer choices
all names for sex cells
Answer: Gametes, sperm and egg
Explanation: Gametes is the overall term for sex cells. Sperm is the male sex cell, and egg is the female sex cell.
According to the top-down (trophic cascade) model of community control, which
trohpic level would you decrease if you wanted to increase the vegetation level in a
community?
Answer:
Tertiary consumers
Explanation:
How do these substances produce light of different colors?
Every substance produces light of different colors on the basis of level of energy that is possessed by the electrons of a substance.
Explanation:
Every substance has its level of energy. Depending upon that energy level the light of different colors id produced. There are electrons present in every substance that is made up of atoms and those atoms consist of electrons.
Whenever an atom is heated, the electrons present get excited and their energy level also increases but when their energy level comes down they emit energy in the form of light. The color of that light depends upon the level of energy of an electron. Each substance emits its color.
The bacteria can chemically combine nitrogen with hydrogen to form ammonia (NH3). This combining process is called nitrogen fixation.
Which group of organisms chemically combines nitrogen with hydrogen in a process called nitrogen fixation?
bacteria
birds and reptiles
only aquatic plants
all mammals
Bacteria
Explanation:
Nitrification fixation takes place by nitrogen-fixing bacteria like Azotobacter, Klebsiella, Bacillus etc which convert atmospheric nitrogen gas into fixed-nitrogen compounds like nitrates or ammonium ions for the plants to readily absorb.
The nitrogen fixing bacteria can be free-living like cyanobacteria or live with symbiotic relationship with plants and fungi.
The chemical conversion of di-nitrogen to ammonia takes place with the help of enzymes like nitrogenase in combination with leghahemoglobin, a protein through a reduction reaction.
Answer:
Bacteria
Explanation:
Took the quiz and got it correct! Good Luck!
2. The following list identifies some adaptations in a beaver which allow it to survive in its environment. Identify each
adaptation as structural, physiological, or behavioral and describe its survival advantage:
(a) Large front teeth: -
(b) Lodge built in middle of pond:
(c) Oil secreting glands in skin:
3. (a) What restricts the amount of time diving animals can spend underwater?
(b) How does reducing heart rate during a dive enable animals to stay underwater longer?
Answer:
The following list identifies some adaptations in a beaver which allow it to survive in its environment. Identify each adaptation as structural, physiological, or behavioral and describe its survival advantage:
(a) Large front teeth: structural adaptation-
(b) Lodge built in middle of pond: survival advantage
(c) Oil secreting glands in skin: physiological
3. (a) What restricts the amount of time diving animals can spend underwater?
The temperature of water determines that
(b) How does reducing heart rate during a dive enable animals to stay underwater longer?
Explanation:
Question 3
a) Lack of oxygen and pressure.
b) Helps the animals maintain adequate oxygen.
Geneva was walking on the beach on a crisp November morning when a cool wind came her way. How would Geneva’s body respond to maintain homeostasis?
Answer:starts to shiver
Explanation:
One way that Geneva’s body respond to maintenance of homeostasis is to begin to shiver to produce heat.
Thermal control of the bodyThe body has a normal temperature of about 37 degrees centigrade. This temperature must be maintained at all times hence when the atmosphere is very cold, the body has to devise a means to maintain heat.
In this regard, a process by which Geneva’s body responds to maintaining homeostasis is to begin to shiver to produce heat.
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Enzymes are sensitive to pH and temperature. If an enzyme’s environment is too hot, the enzyme cannot
Temperature and pH levels have critical roles in enzyme activity; high temperatures and extreme pH levels can cause denaturation, affecting their ability to bind to substrates and catalyze reactions.
Explanation:Enzymes, which are biological catalysts, are highly sensitive to changes in temperature and pH. At high temperatures, the delicate balance of chemical bonds within the enzyme's active site is disrupted, leading to denaturation, which is an irreversible loss of structure and function. This process affects the enzyme's ability to bind to its substrate and catalyze reactions efficiently. Similarly, the pH level affects enzyme activity. Each enzyme is adapted to an optimal pH range, and exposure to extreme pH levels can also result in denaturation. For example, gastric protease requires an acidic environment to function but is inactivated in the alkaline medium of the small intestine to prevent damage.
There are various hypotheses as to the origin of prokaryotic and eukaryotic cells. Because all cells are similar in nature, it is thought that all cells came from a common ancestor cell called the last universal common ancestor or LUCA. The LUCAs evolved into three different cell types, each representing a domain in the modern system of classification. The three domains are the Archaea, the Bacteria, and the Eukarya. We know that all three domains are cellular in nature, but they have one other feature in common. And this second common feature helped provide the biochemical evidence to support this newest step in classification. Cite the evidence utilized in this classification scheme.
Answer: D
Explanation: took the usatestprep quiz
There are three domains of life-based, in which organisms can be classified on the basis of differences in the sequences of nucleotides in the cell's ribosomal RNA.
What is ribosomal RNA (rRNA)?Ribosomal RNA is a type of noncoding RNA that is present in all living organisms, it is a site of synthesis of protein.
During protein synthesis, the ribosome acts as a catalytic enzyme for the synthesis of the polypeptide chains. To observe variation in rRNA sequences, it is possible to differentiate organisms on just about the species level and trace evolutionary relationships.
These variations suggest that all cells originate from a common ancestor cell called the last universal common ancestor or LUCA.
Therefore, three domains of life are classified on the basis of differences in the rRNA sequence.
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what is the rock cycle
Answer: an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.
Explanation:
Examine the four skeletons.
Indicate which species appears to be best
adapted for swimming underwater for a long
time. Which characters allow the animal to
behave this way?
Answer: Frog is the answer because it is adapted for Swimming.
Explanation:
Amphibians are animals that have evolved to be able to live both on land and in water. Each habitat must be inhabited for the entirety of the life of the live organism. Think of a frog. The skin is smooth with numerous mucus glands and thus resulting in moist skin.
The characters allows the Frog to swim underwater for a long time :
1. Frogs can live on the land as well as in the pond habitat.
2. Frogs are adapted to live in water because of their webbed back feet, which enable them to swim in it.
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Final answer:
The species best adapted for swimming underwater for a long time would have a streamlined fusiform shape to reduce drag and may possess flippers or fins for propulsion. Other adaptations might include endoskeletons for muscle attachment and support without overly restricting size.
Explanation:
In examining skeletons to determine which species is best adapted for underwater swimming, key anatomical features should be considered. Species that are well-adapted for extended periods of swimming underwater typically possess a fusiform shape, which is a streamlined body tapered at both ends to reduce drag. This shape is crucial because water has a higher viscosity compared to air, resulting in more resistance against movement.
Furthermore, other adaptations in aquatic animals might include flippers or fins to aid in propulsion, a large lung capacity or the ability to hold their breath for long periods, and sometimes, a reduced skeletal structure that allows for more flexibility and maneuverability underwater. In contrast, exoskeletons often limit an animal's size and may not be as common in species that swim long distances underwater. An endoskeleton, on the other hand, can provide the necessary support for muscles required for movement without overly restricting size. Therefore, when examining the four skeletons, the species with a fusiform body shape, potentially paired with features like flippers or fins, would likely be the best adapted for swimming underwater for extended periods.
Planet X has a moon similar to Earth's moon.
Which path would this moon's orbit take?
If for some reason, the planet is destroyed and no
longer exists, which path would the moon take?
Planet X
Answer:
Planet X has a moon similar to Earth's moon.
Which path would this moon's orbit take? 3
If for some reason, the planet is destroyed and no
longer exists, which path would the moon take? 2
Explanation:
There are none of these planets in our solar system. But they might exist in other star systems. There, some moons might escape their parent planets’ gravity and start orbiting their parent stars instead. That’s according to new computer simulations. Scientists have dubbed the liberated worlds “ploonets.” And, the scientists say, current telescopes may be able to find the wayward objects.
HELPPP‼️‼️
In most medical procedures, hazardous waste
is produced. This waste is usually burned,
which can release chemicals like mercury into
the air.
How could technology be best used to solve
this problem?
O A. Incinerate the waste in areas with low
populations.
O B. Reduce the number of medical
procedures performed.
O C. Store the waste underground instead of
burning it.
O D. Find a way to trap the mercury before it
is released.
Answer:
Its D
Explanation:
It's the only answer that would actually be a benefit
Finding a way to trap the mercury before it is released into the atmosphere could be the best technology which is used to solve this problem. Thus, the correct option is D.
What is the hazardous medical waste?Hazardous medical waste is anything which has the ability to affect humans in the various non-infectious ways. This waste can include things such as chemicals which are medical and industrial, old drugs, and sharp equipment such as needles, scalpels, lancets, etc.
The best technology which can be used should be finding a way to burn the hazardous medical waste without releasing chemicals in the nature. It could be that gases produced are passed through the filters to filter out all the hazardous substances out or other ways which can eliminate the hazardous chemicals.
Therefore, the correct option is D.
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In order to keep the soil fertile, farmers often change the crop that is grown in a field every two to three years. What is this process called?
A.
sharecropping
B.
crop conservation
C.
organic farming
D.
crop rotation
Answer:
Crop rotation
Explanation:
It is done so that the soil of farms is not used for only one set of nutrients. It helps in reducing soil erosion and increases soil fertility and crop yield.
what is the function of the small intestine?
The small intestine is responsible for most chemical digestion and the absorption of nutrients. It uses villi and microvilli to greatly increase its surface area, allowing efficient transfer of nutrients into the bloodstream, subsequently heading to the liver for regulation and detoxification.
Explanation:The small intestine is a pivotal organ in the digestive system responsible for the chemical digestion of food and absorption of nutrients. It starts at the stomach and extends to the large intestine, measuring approximately 23 feet in length in adults. The interior of the small intestine features an expansive area created by structural adaptations like circular folds, villi, and microvilli that can compare to the size of a basketball court.
Primarily, the small intestine completes the digestion of proteins, fats, and carbohydrates, facilitated by a variety of enzymes from both the pancreas and the intestine itself. Additionally, villi, which are finger-like projections, and microvilli that sit atop the villi, dramatically increase the surface area available for absorbing nutrients. These villi are essential in transporting the digested nutrients into tiny blood vessels and, subsequently, into the bloodstream. Once in the bloodstream, the nutrients are conveyed through the hepatic portal vein to the liver, where they are regulated and detoxified if necessary.
Which product is typically made using hardwood?
O
A. Plywood shed
O
B. Utility pole
O
C. Fencing
O
D. Flooring
Answer:
D. Flooring
Explanation:
Answer:
D. Flooring is the Answer here.
Explanation:
Flooring is the answer here however in reality all are hardwoods except for plywood sheds is hardwood. Reason being is hardwood tends to last longer so utility poles are made from them Fencing depending on location you live but do it its ability to last fences are made from it. and yes, flooring as we have all herd of how nice hardwood floors are, for the same reason it's used for everything else. A great many things are made from hard wood but make no mistake this answer is (D) flooring. this question is to slip you up.
What are small distal branches of an axon
Answer:
Telodendria can be described as the small, distal branches of an axon.
The membrane of an axon is termed as a axolemma. The cytoplasm of the axon is termed as the axoplasm. The end branches of an axon are called telodendria.
An axon can be described as a nerve fiber which carries electrical impulses.
Small distal branches of an axon are referred to as axon terminals or terminal buttons, playing a critical role in transmitting nerve impulses to other cells through synapses.
The small distal branches of an axon are known as axon terminals or terminal buttons. These are crucial for the transmission of nerve impulses to other neurons or muscle cells. Each axon may end in multiple axon terminals, which connect to the dendrites of other neurons through a complex membrane junction known as a synapse. The process of information transmission at these synapses involves the release of neurotransmitters, allowing signals to be communicated to receiving cells.
To support efficient signal transmission, axons are often enveloped by a myelin sheath, a layer of fatty tissue that acts as an insulator and enhances the speed at which an electrical signal can travel along an axon. Notably, there is never more than one axon per neuron, but an axon can branch out several times, enhancing the neuron's ability to communicate with multiple cells.
Do dolphins understand the difference between seeing another dolphin in front of them, and seeing their own reflection? *
Yes or
No
Answer:
um no I dont think so
Explanation:
" Yes, dolphins can understand the difference between seeing another dolphin and seeing their own reflection.
Dolphins are highly intelligent marine mammals with sophisticated cognitive abilities. They possess a level of self-awareness that allows them to distinguish between their own reflection and another dolphin. This has been demonstrated through the mirror test, which is used to assess self-recognition in animals.
In studies where dolphins have been exposed to mirrors, they have shown behaviors indicating that they recognize themselves. For example, they may investigate parts of their bodies that they cannot see without a mirror, suggesting that they understand that the reflection is of themselves. This level of self-awareness is a strong indicator that dolphins can differentiate between their own image and that of another dolphin.
Furthermore, dolphins use echolocation to perceive their environment, which provides them with detailed information about objects, including other dolphins. They can discern the difference between the echoes returning from another living dolphin and those from an inanimate object or their own reflection.
Therefore, based on scientific evidence and observed behaviors, it is concluded that dolphins do understand the difference between seeing another dolphin and seeing their own reflection."
Cells are the basic units of life in living organisms. Which of the following components make up cells? A. atoms and molecules B. atoms and tissues C. tissues and organs D. molecules and organs
Answer:
Cells are the basic units of life in living organisms. Which of the following components make up cells?
Atoms and molecules
Explanation:
All cells are made up of organelles and the smallest part of it makes it an atom while formation of two or more atom makes up a molecule. Every living cell compose of both atom and molecule
Yo sup??
the correct answer is option A ie
atoms and molecules
these are said to be elementary particles which form other things and were once said to be indivisible.
Hope this helps
What is the function
of the stem on a plant?
People use fallen tree limbs for fuel when their population is
Answer:
People use fallen tree limbs for fuel when their population is DENSE.
Explanation:
Answer: When populations are stable people use fallen tree limbs for fuel ,which does not harm the trees.
Explanation: When populations grow rapidly,deadwood does not accumulate fast enough to provide fuel.
3. Which of the following would an animal breeder use to increase the number of cows that give the
most milk?
a. overproduction
b. genetic isolation
d. artificial selection
Answer:
artificial selection
Explanation:
artificial selection means the same as selective breeding, selective breeding is where humans take two animals of the same breed and breed them for certain characteristics
what is the genotype of a heterozygous person with a cleft chin?
Answer:
Cc
Explanation:
A cleft chin is an example of a trait that is controlled by genetics. A cleft chin is when there is a dimple in the chin which arises when the two sides of the jaw don’t completely fuse together. Famous people with cleft chins are Henry Cavill, John Travolta and Niall Horan.
A cleft chin is generally thought to be a dominant trait. That means, if an individual carries one copy of the cleft chin gene (heterozygous), then they will display the trait.
There are three options: an individual can be homozygous dominant (CC), homozygous recessive (cc) or heterozygous (Cc). A heterozygous person will always have 2 different alleles (for any trait, not just cleft chin). In this case, a heterozygous person will have a cleft chin, because it is dominant. Therefore, an heterozygous person with a cleft chin will be Cc
Remember, the letter doesn't matter - they could also be denoted as Bb, Qq, Rr, Ff. The letter is arbitrary.