Evolution can be described as the change in the allele frequencies of a gene pool over time. The process of natural selection acts on specific phenotypes and causes a change in the frequency of the alleles that produce them. A population of organisms with similar phenotypes that interbreed is defined as a species. Note that species evolve, not individuals.
Explanation:
Evolution is the gradual change in species over time due to selective response processes.
Natural selection of species leads to overproduction of species, variation or habitability of heritable characteristics, selection of inherited traits or phenotypes which aid the species to better suit to their environment, and to enhance and maintain the species fitness to survive and thrive in their environment.
Natural selection leads to genetic drift or shift in the gene pool to develop favorable phenotypes under random circumstances through bottleneck or founder effects.
The frequency distribution of phenotyes follows a bell curve due to either directional, stabilizing, or disruptive natural selection processes. The group or population with similar type of traits or phenotypes which can interbreed among themselves are collectively called as species.
The evolutionary changes are exhibited or observed in the species as a whole and not in an individual organism due to evolutionary processes like co-evolution, divergent and convergent evolution.
By which processes are rocks broken up and moved to different locations?
A) Burial and cementation
B) Evaporation and condensation
C) Compaction and transportation
D) Weathering and erosion
Answer:
D.) Weathering and erosion
Explanation:
Weathering is the breaking down of rocks through (usually) natural processes such as rain, wind, etc.
Erosion is the process in which the sediments of these rocks are carried away through natural process.
Why do you get less energy from 100 calories of celery than you would from 100 calories of chips?
Answer:
chips are a simple carbocarbohydrate and celery is a complex carbocarbohydrate
Explanation:
what is carrying capacity
Answer:
B) The largest population an area can support
Once the body has begun shivering, what happens to make it stop shivering?
A)When body temperature returns to normal, the respiratory system sends a message to the skeletal system to stop shivering.
B)When body temperature returns to normal, the nervous system sends a message to the muscular system to stop shivering.
C)When body temperature is below normal, the nervous system sends a message to the skeletal system to stop shivering.
D)When body temperature is below normal, the respiratory system sends a message to the muscular system to stop shivering.
Answer:
B
Explanation:
Brain/nervous system in charge of everything
Shivering stops when the hypothalamus in the brain signals that body temperature has returned to normal, prompting the nervous system to halt the muscle contractions.
Explanation:When the body begins to shiver due to cold, this is part of a process called thermoregulation, coordinated by the nervous system to maintain homeostasis. The hypothalamus in the brain detects that the body temperature is below its set point and initiates shivering to generate heat. Shivering involves rapid contractions of the skeletal muscles, which help to increase body temperature. Once the temperature returns to the normal range, the hypothalamus sends signals, via the nervous system, to stop the shivering response.
Therefore, the correct answer to the question is B) When body temperature returns to normal, the nervous system sends a message to the muscular system to stop shivering.
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Why is “humans have little to no effect on species” a misconception?
Answer:
Because they take over animals home, food, and lives with poaching, deforestation and pollution.
Explanation:
Explain how your parents, grandparents, & great grandparents may affect what proteins your cells are able to make.
Final answer:
Proteins are responsible for cell functions and structure. Genes and epigenetic changes can be influenced by parents, grandparents, and great grandparents, affecting the proteins cells can make.
Explanation:
Proteins are responsible for orchestrating nearly every cell function. They determine the structure and function of cells. Your parents, grandparents, and great grandparents can affect what proteins your cells are able to make through their DNA and epigenetic changes.
Genes in DNA provide instructions for making proteins with the correct sequence of amino acids.
Epigenetic changes can determine whether genes are turned on or off, affecting the production of proteins in certain cells.
The unique genetic makeup and environmental factors of your ancestors can influence the proteins your cells are able to produce.
What is the best definition of Thebes term “theory”as it is used in science
The best scientific definition of Thebes' term "theory" is a well-substantiated explanation of some aspect of the natural world obtained through the scientific method after observation and experimentation.
What is the significance of this scientific theory?Scientific theory has many implications, as the science provides a comprehensive and consistent explanation, and a theory can make accurate predictions about new observations and experiments and help in the continuation of further scientific research. Scientific theories have practical applications to solve real-world problems, such as in the medical field with technologies, etc.
Hence, the best scientific definition of Thebes' term "theory" is a well-substantiated explanation of some aspect of the natural world obtained through the scientific method after observation and experimentation.
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Final answer:
A theory in science is a well-supported comprehensive explanation of natural phenomena, akin to a fact, and is vital for making predictions about the natural world. It is much more than a guess, distinguishing it from the everyday use of the term 'theory'.
Explanation:
In the context of science, the term theory refers to a comprehensive explanation of an important feature of nature that is supported by a substantial body of evidence. It's important to distinguish this scientific use of the term from the way 'theory' is used colloquially, where it might just mean a guess or speculation. Scientifically, a theory is akin to a fact and represents our most reliable understanding of natural phenomena. Examples of scientific theories include the theory of evolution, cell theory, and germ theory.
The United States National Academy of Sciences defines a theory as a well-established scientific explanation that is unlikely to be altered by new evidence. This conceptual framework allows scientists to make predictions about phenomena that have not yet been observed, placing theories at the bedrock of scientific understanding of the natural world.
You discover a new species of aerobic, mixotrophic protist that can perform photosynthesis in fairly deep water (for example, 250 m deep). It can also crawl about and engulf small particles. Which two characteristics does your protist have to have in order to successfully complete these tasks?
1. hydrogenosome
2. apicoplast
3. pseudopods
4. chloroplast from red alga
5. chloroplast from green alga
A) 1 and 2
B) 2 and 3
C) 2 and 4
D) 3 and 4
E) 4 and 5
Answer:
D) 3 and 4
Explanation:
Pseudopods is a tool for movement in many protists such as amoeba. Pseudopods is the extension of cytoplasm which enables the organism to move from place to place and capture the food by engulf small particles. This protists has chloroplast because chloroplast is responsible for the production of food materials from sunlight in the process of photosynthesis.
What happens immediately after pyruvate is brought into the mitochondrion?
A. Acetyl CoA forms.
B. 36 ATP molecules form.
C. Glucose molecules form.
D. FADH2 molecules form.
Answer:
The answer is A: Acetyl COA forms
Explanation:
Fascioloides magna is an animal that lives in the livers of deer in the southeastern United States. It has a bilaterally symmetrical, flattened leaf-like body with a digestive tract with a single opening. It also lives in a snail for part of its life cycle. This animal is most likely a _____.
Answer:
Fluke
Explanation:
A fluke is referred to as trematode, a type of parasitic worm that belong to phylum plathyhelminthes. A fluke has a flattened body structure with about few centimetres long. Flukes do not possess an excretory system, but possess a digestive tract with just one opening that serves as both mouth and anus. Also, they do not posses respiratory organs .
Flukes possess a body surface that enables it inhabit the digestive system of larger animals and also avoid the effect of digestive enzymes.
These parasitic worms can be found to infect vertebrates and molluscs, such as snails. An example of a fluke is Schistosoma haematobium.
Which of the following statements regarding cnidarians is true? The digestive and circulatory compartment of cnidarians is called the gastrovascular cavity. Cnidarians have three true tissue layers. Cnidarians are herbivores and can be destructive grazers on seaweeds. The more stationary cnidarian body form, which is cylindrical with a ring of tentacles, is the medusa.
The last one I think xd
The digestive and circulatory compartment of cnidarians is called the gastrovascular cavity. So, the correct option is (A).
What are Cnidarians?The word Cnidaria derive from the Greek word "cnidos," which means stinging nettle.
Cnidaria is the phylum which comes under Kingdom Animalia. This phylum contains over 11,000 species of aquatic animals found in both freshwater and marine environments. Their specialty is cnidocytes which are specialized cells which they use mainly to capture prey.
The gastrovascular cavity is defined as the major site for digestion of food and absorption of nutrients in cnidarians in which food passes through the mouth and enters the cavity. Inside the gastrovascular cavity, there is a cell membrane that wraps around food particles and then moves them into the internal cavity.
Thus, the digestive and circulatory compartment of cnidarians is called the gastrovascular cavity. So, the correct option is (A).
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How does the circulatory system help the digestive system?
PLEASE HELP
1. Which description best summarizes the steps that take place during black hole formation, in the correct order?
Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.
Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly.
A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses.
A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova.
2. Astronomers think that most galaxies are centered by a (nebula, large planet, black hole, massive star), which exerts (centripetal force, magnetic pull, gravitational pull, centrifugal force) that binds the galaxy together.
3. Where would scientists look to observe a black hole?
The center of the Milky Way
The center of the sun
The solar system asteroid belt
The edge of the solar system
Answer:
1. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses
2. black hole; gravitational pull
3. The center of the Milky Way
Explanation:
The description that summarizes the steps that take place during black hole formation, in the correct order is C. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; the core of the star collapses.
Astronomers think that most galaxies are centered by a black hole which exerts a gravitational pull that binds the galaxy together.
In order for scientists to observe a black hole, they should look at the center of the Milky Way.
Black hole simply means the region of spacetime where there's a strong gravity such that there's no electromagnetic radiation or particles that can escape.
It was believed that black holes were formed after the Big Bang when there was a collapse of the center of a massive star. The formation is that a massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; the core of the star collapses
In order for scientists to observe a black hole, they should look at the center of the Milky Way which is the hit collection of gas, stars and dust.
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Food webs show the movement of energy through an ecosystem. The energy decreases as it moves from organism to organism. Where does the energy originally come from?
Answer:
the sun
Explanation:
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how does the west nile virus spread?
Answer:
West Nile virus is most commonly spread to people by the bite of an infected mosquito. Mosquitoes become infected when they feed on infected birds. Infected mosquitoes then spread West Nile virus to people and other animals by biting them.
Explanation:
Sponges have no “true tissues.” What does this mean?
A.
They perform body functions by diffusion.
B.
They have organs for specific functions.
C.
Similar cells do not cooperate together.
Answer:
C.
Similar cells do not cooperate together.
Explanation:
What are some facts about the coral reefs useful for a presentation
Why are organisms classified
Answer:
All living things are organized into groups by scientists as they are identified. ... Different scientists use various systems of classification to organize all living things into groups. Overall, the reason scientists classify living things is to understand the relationships between different organisms.
Explanation:
Enter your scientific design in the space below.
Answer:
Divide plants into two groups of twenty-five. Plant twenty-five seeds in pots with potting soil without compost; this is the control group. Plant the other twenty-five in pots with potting soil and a specific amount of compost added; this is the experimental group. Place the pots under grow lights. After germination, measure the height of the plants at set intervals (e.g., every two days) for a set amount of time (e.g., two weeks). The IV is the presence or absence of compost. The DV is the height of plants. Twenty-five plants per group is a good sample size; all obvious variables are controlled. The experiment is simple and specifically described, so it can be replicated. The seeds were assigned randomly; there is no obvious bias in the experiment.
Answer:
Divide plants into two groups of twenty-five. Plant twenty-five seeds in pots with potting soil without compost; this is the control group. Plant the other twenty-five in pots with potting soil and a specific amount of compost added; this is the experimental group. Place the pots under grow lights. After germination, measure the height of the plants at set intervals (e.g., every two days) for a set amount of time (e.g., two weeks). The IV is the presence or absence of compost. The DV is the height of plants. Twenty-five plants per group is a good sample size; all obvious variables are controlled. The experiment is simple and specifically described, so it can be replicated. The seeds were assigned randomly; there is no obvious bias in the experiment.
Explanation:
Edg 2022 >:)
Butterflies of the genus colias live in the rocky mountains. Why do they exist in this types of area?
Answer:
This is because these species of butterflies has two variant of enzymes.which makes them well adapted to the varied range of temperature exposed to in this habitat, and therefore ensures their activity at wide temperature ranges.
Generally, rock mountains has wide range of temperature. Therefore the possession of variant of enzymes ensures sustainable of biochemical reactions for survival of theses species because of the resistance of these enzymes to high varied rocky temperature.
Explanation:
Which of the following best explains why the number of organisms at each level decreases while moving up the energy pyramid? A. The animals at each level use energy, so only a small amount of their energy is available to the next level. B. The animals at each level have more predators, so they produce more offspring. C. The animals at higher levels are more competitive, so fewer animals survive. D. The animals at higher levels move more than animals at lower levels, so they require more energy.
Answer:
The animals at each level use energy, so only a small amount of their energy is available to the next level.
Explanation:
I did it on Study Island
An energy pyramid is a graphical representation of the energy in the trophic levels of an ecosystem. The animals at each level use energy, so only a small amount of their energy is available to the next level due to this, the number of organisms at each level decreases while moving up in the energy pyramid.
What is an energy pyramid?The energy pyramid shows the flow of energy from one trophic level to the other which is always upright.
The four levels of energy pyramids are:
Producers.Primary consumers.Secondary consumers.Tertiary consumers.The animals at each level use energy, so only a small amount of their energy is available to the next level. It means the energy is lost after each trophic level.
Due to this decrease in energy level at the successive levels, the number of organisms decreases while moving up in the pyramid of energy.
Thus, the correct option is A.
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For each of the 6 Kingdoms: Give the name, 3 characteristics, one reason they are important, and one example
Answer:
Explanation:
Kingdom fungi- fungi are organism that are both unicellular and multicellular. They do not photosynthesize but the derive nutrients from decayed organic matter example is mushroom,yeast,mold
Kingdom protista- Protist are eukaryotic organism, we have plant like and animal like protista. The plants have chloroplast and the animal have mitchondria example is Euglena,amoeba
Kingdom animalia- Animals are multicellular organisms and they are eukaryote. They reproduce sexually to produce offspring and they depend on plant and other organism for their food. Example include mammals, sponges, insect.
Kingdom plantae- plant are primary producer, they produce their food through photosyntheis.
Plant could be vascular or non vascular and they support life through the release of oxygen and provision of food. Example tree crops ,grasses and vegetables.
Kingdom Archaebacteria- they are prokaryote with unique cell wall that allows them thrive in hot spring and hydrothermal passage. Example is thermophiles,methanogens.
Kingdom Eubacteria- they are bacteria, they are microscopic in natural, with unique body shapes. The multiply and grow at a very fast rate under optimum condition. E.g Actinobacteria, cyanobacteria
Use the drop-down menus to answer the questions. In which stage of the cell cycle does the division of the cytoplasm occur? In which stage of the cell cycle does replication of DNA occur? In which stage of the cell cycle does the division of the nucleus occur?
Answer:
cytokinesis - interphase - mitosis
Explanation:
just took this on edge
In which stage of the cell cycle does the division of the cytoplasm occur?
✔ cytokinesis
In which stage of the cell cycle does replication of DNA occur?
✔ interphase
In which stage of the cell cycle does the division of the nucleus occur?
✔ mitosis
An ecosystem is self-sustaining as long as organisms have sufficient quantities of energy, oxygen, minerals, and water. When organisms die, some of these materials are recycled back to plants in the ecosystem primarily through the activity of:______.(1) predators (2) pathogens(3) decomposers (4) parasites
Which word in this sentence could be replaced with a personal pronoun?
Gina felt very nervous before giving her speech.
Gina
very
before
giving
Answer:
Gina
Explanation:
Answer: Gina
Explanation:
Signal to which an organism responds
A stimulus is a signal to which an organism responds. Stimuli can be internal like hunger or thirst, or external like change in temperature or light. An organism's evolutionary adaptations often determine its responses to these signals.
Explanation:A signal to which an organism responds is known as a stimulus. Stimuli can be external or internal. External stimuli include changes in the environment like temperature, light, or sound. Internal stimuli come from within the organism itself, such as hunger or thirst. An organism's response to a stimulus is often a result of adaptations developed over time. This reactionary process is a critical aspect of an organism's survival and continued existence.
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Organisms respond to signals or stimuli surrounding them in their environment. These reactions can be a movement towards or away from the stimuli or diverse forms of communication within species. Even single-celled organisms like bacteria can process and respond to environmental signals.
Explanation:The signal to which an organism responds can vary widely, but generally, it refers to environmental cues or stimuli which trigger a reaction or response in the organism. Sensitivity or response to stimuli is an inherent characteristic of living organisms, emphasizing their ability to interact with their surroundings. This response can include movements towards or away from the source of stimuli (positive or negative response).
For instance, a plant might respond positively to a light source by bending towards it, a reaction known as phototaxis. Likewise, bacteria can move towards or away from chemical sources (chemotaxis) or light (phototaxis).
Communication within species also involves the use of signals as stimuli. Particularly, animals engage in communication using signals that could be visual, aural(sound), chemical (like pheromones), or tactile(touch). In some species such as the three-spined stickleback, a red region in the lower half signals males to become aggressive and females to mate. These stimuli-based responses can be instinctual, learned, or a mix of both.
Single-celled organisms, like bacteria, are also capable of signal processing. They respond to environmental signals like nutrient levels by using intracellular signaling, and sometimes, they release molecules as signals to communicate with each other.
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4 What is a difference between prokaryotic and eukaryotic cells? A. Prokaryotic cells always have cell walls, but eukaryotic cells do not. B. Eukaryotic cells do not have membrane-bound organelles, but prokaryotic cells do. C. Prokaryotic cells do not have a nucleus, but eukaryotic cells do. D. Organisms with eukaryotic cells are always multicellular, but organisms with prokaryotic cells are not.
Answer:
d
Explanation:
i learned this a week ago
Pathogens that are catalase-positive, such as Mycobacterium tuberculosis, Legionella pneumophila, and Campylobacter jejuni, make catalase in order to deactivate harmful peroxide radicals, thus allowing them to survive unharmed within the host cell. Which of the following are features of the catalase enzyme?
a. endoenzyme
b. inducible
c. extracellular enzyme
d. constitutive
Answer:
B)inducible
C. )extracellular enzyme
Explanation:
Catalase is an enzyme that is engaged during the the decomposition of hydrogen peroxide to form water and oxygen, it is posses by all living organisms because of their exposure to oxygen, hence it protect the cell from oxidative damage by reactive oxygen species.
Catalase enzymes function in our liver by breaking down harmful hydrogen peroxide into oxygen and water ,during this reaction , the bubbles of oxygen gas that escape create a foam that will help to disinfect any surface touch by the raw liver during this process. Catalase enzymes are extracellular enzyme and are inducible.
What is it called when plants give off water vapor as a waste product?
Answer:
transpiration
Answer: transpiration
Explanation:
Francis thinks that the longer a plant is in light, the more fruit it will produce. He places one group of ten plants under a UV light for six hours and another group of ten plants under the same light for eight hours. He waters the plants with the same amount of water at the same time every day; uses the same types of plants, soil, and containers; and monitors the same temperature
Answer:
Choose the correct label for each part of the experiment.
The plants that are under a UV light for eight hours
A. Experimental group
The amount of water that is given to all of the plants
D. controlled Variable
The plants that are under the light for six hours
B. Control Group
Explanation: