b. A large rock falls from a cliff and breaks as it hits other rocks
Is this statement true or false? The period before we have written records is called prehistory. true o false
Answer:true
Explanation:
What makes amino acids different from each other?
A) Amino group
B) Carboxyl group
C) Hydrogen atom
D) Side chain
Which of the following are
factors in weathering and
erosion?
1. Precipitation
2. Temperature
3. Gravity
4. Wind
5. Deforestation
6. Acid
Answer:
please mark brainliest!
Explanation:
- Physical Weathering.
- Chemical Weathering.
- Water Erosion.
- Wind Erosion.
- Gravity.
Answer:
5. deforestation
4. wind
3. gravity
1. precipitation
Question 1
Choose all that apply: The cells in the human body that undergo mitosis are:
a
skin cells
Ser cells
liver cells
muscle cells
Answer:
liver skin and muscle cells
Explanation:
The cells in the human body that undergo mitosis are -
skin cells liver cellsmuscle cellsCell division is the process of producing new daughter cells from existing parent cells. The types of cell division include mitosis and meiosis.
Mitosis takes place in all eukaryotic cells which is a process of cell renewal and growth.Somatic cells, adult stem cells, and the cells in the embryo are the main cells that undergo mitosisSomatic cells are the regular cells in the body of multicellular organisms such as muscle, liver, and skin cells.Thus, The cells in the human body that undergo mitosis are -
skin cells liver cellsmuscle cellsLearn more:
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Worksheet 5 Cell Division for students answerkey from umuc
Answer:
binary fission,meiosis and
mitosis,
What biome receives the least rainfall
Answer:
deserts
Desert biomes are the driest of all the biomes. In fact, the most important characteristic of a desert is that it receives very little rainfall. Most deserts receive less than 300 mm a year compared to rainforests, which receive over 2,000 mm.
Explanation:
what are 3 ways your skin protects you
Answer:
The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold.
How do your interactions
with nonliving systems affect your
environment?
Explanation:
Interactions between different organisms are numerous and are usually described according to their positive (beneficial), negative or neutral effect on others.
The interactions between living things and their non living environment makes up a total ecosystem; understanding any one part of it requires knowledge of how that part interacts with the others. Ecosystems do not ‘collapse’ but do change in function, structure and composition over time due to natural or human disturbance (examples include the impact of drought, flooding, mowing and herbicides).
A biomass pyramid of an ecosystem is shown.
Tertiary consumers
Secondary consumers
Primary consumers
Producers
Which statement provides the best explanation for the difference in biomass of organisms found at each trophic level?
A. Organisms at higher trophic levels have less energy available to them than organisms at lower trophic levels.
B. Organisms at higher trophic levels require smaller habitats than organisms at lower trophic levels.
c. Organisms at lower trophic levels provide less energy than organisms at higher trophic levels.
D. Organisms at lower trophic levels outcompete organisms at higher trophic levels.
Answer:A
Explanation:
The statement provides the best explanation for the difference in biomass of organisms found at each trophic level is: organisms at higher trophic levels have less energy available to them than organisms at lower trophic levels.
WHAT IS TROPHIC LEVEL:Trophic level of an organism refers to the position of the organism in the flow of energy in an ecosystem. Organisms feed on one another in an ecosystem to obtain energy needed for their metabolic activities. More energy is contained in lower trophic levels than that of higher trophic levels. This means that, according to this question, more energy is in the producers than tertiary consumers.Therefore, the statement provides the best explanation for the difference in biomass of organisms found at each trophic level is: organisms at higher trophic levels have less energy available to them than organisms at lower trophic levels.
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How do I explain this? ‘The plant shows the characteristic responding to environment because...’
phototropism : shoot grows upwards in response to light stimulus.
hidrotropism : roots grow to the area with the highest water concentration.
geotropism : a coordinated process which shoot grows against gravity while root grows down the gravity.
Who were the earliest Astronomers
Answer:
The Ancient Greeks developed astronomy, which they treated as a branch of mathematics, to a highly sophisticated level. The first geometrical, three-dimensional models to explain the apparent motion of the planets were developed in the 4th century BC by Eudoxus of Cnidus and Callippus of Cyzicus.
Explanation:
I hope it helped
Answer:
Most of the earliest Astronomers were the Ancient Greeks.
5)
Which statement is an example of an inference that a student makes to determine that this is likely a plant cell?
A)
The cell is too small to be seen by the eye.
B).
The cell appears to have a nucleus and vacuoles.
Eliminate
The cell appears to have a large area of cytoplasm.
D)
The cell appears to be rectangular in shape and has a cell wall.
Answer:
D) the cell appears to be in a rectangular shape and has a cell wall
Explanation:
animal cells don't have cell walls
What are the Five characteristics of life
Answer:
The five characteristics of life are
Cells.
Obtain and Use Energy.
Reproduction.
Respond to the Environment.
Adapt/Evolve.
Explanation:
What happens to a watershed if it rains
Answer:eh water could either be drained into the soil or land on plants to become dew
Explanation:i searched up what a watershed was lol
To be characterized as a chordate, an organism must:________.
A) possess a backbone in both the larval and adult stages
B) display all four key characteristics of Chordata in both the larval and adult stages
C) display each of the four key characteristics of the chordates at some point in the life cycle
D) possess a backbone in at least one life stage.
Answer:
C) display each of the four key characteristics of the chordates at some point in the life cycle
Explanation:
To be characterized as a chordate, an organism must display each of the four key characteristics of the chordates at some point in the life cycle. Therefore, the correct option is C.
To be characterized as a chordate, an organism must display four key characteristics at some point in its life cycle.
These characteristics include having a notochord (a flexible rod-like structure), a dorsal hollow nerve cord, pharyngeal slits or pouches, and a tail.
It is not necessary for all four characteristics to be present simultaneously or in both the larval and adult stages. As long as the organism exhibits these characteristics at some stage of its life, it can be classified as a chordate.
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A focus of environmental science not studied in ecology is the
Answer:
The influence of human activities on the environment
Explanation:
Anthropogenic activities may have negative effects on the environment by declining its biodiversity and by reducing natural resources. Human activities affect the environment through the use of fossil fuels (greenhouse gases), by contributing to the pollution of extensive areas, by overpopulation, eutrophication, deforestation, etc. The most significant effects of anthropogenic activities include the loss of biodiversity, climate change (global warming), habitat fragmentation, environmental degradation (e.g., ocean acidification), the introduction of invasive species, species extinction, etc.
Answer:
Ecology is the study of all organisms in an environment
Environmental science is the study of the interrelatedness of everything in that environment
Explanation:
Which of the following statements regarding restriction enzymes is NOT true?
A) Most restriction enzymes recognize sequences of 20-25 bp in length.
B) Bacteria can add methyl groups to their DNA to prevent digestion by endogenous restriction enzymes.
C) Most restriction enzymes recognize palindromic sequences in host DNA.
D) Restriction enzymes may produce either sticky or blunt ends when digesting host DNA.
Answer:
The correct option is option A
Explanation:
Restriction enzymes are endocleases that cleave DNA fragment (of usually four, five or six nucleotide long) at specific sites to produce blunt or sticky ends. They recognize palindromic sequences of host DNA when cleaving the specific sites. The sequences below (on complementary strands) give an example of a palindromic sequences.
5'-CCC║GGG-3'
3'-GGG║CCC-5'
As can be seen above, when read from 5' to 3', the two sequences are the same despite being on opposing strands. And when cut between the guanine (G) and cytosine (C) (as shown above), it produces a blunt end. But when cut as shown below produces a sticky end.
5'- G║AATTC -3'
3'- CTTAA║G -5'
The explanation above shows options C and D are right while option A is wrong (hence the correct option).
Also, bacteria prevent their own DNA from been digested by restriction enzymes by adding methyl group to their restriction sites which prevents restriction enzymes from recognizing restriction sites of their DNA; this generally makes bacterial DNA to be highly methylated. This explanation makes option B right also.
Which foods would have the following nutrient test results? (results shown below)
a. beef, peanut butter, tuna
b. apple juice, honey, orange juice
c. candy, table sugar, cola
d. pasta, bread, crackers
Which of the following is true of food webs?
a. Food webs don't actually exist in nature.
b. A food web shows the flow of decomposers
from producers to consumers and, finally, to
producers.
c. In food webs, detritivores break down organic
waste to return nutrients to the ecosystem.
d. When diagramming food chains and food
webs, the arrows should be drawn from the
lower trophic levels to the higher levels to
show the flow of energy.
e. As energy is moved up the food web, most of it
is conserved by the species in the next trophic
levels.
Answer:E
Explanation:
The outer structure of the neuron is made of a
a semipermeable membrane
5. If a galaxy is moving away from us, what would happen to the wavelengths of light that we see? How
would that change what we see?
The visible light spectrum. Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us. ... When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.
Which of the following could not easily cross the plasma membrane? A. Water B. Carbon dioxide C. Oxygen D. All of the above could easily cross the plasma membrane.
Answer:D
Explanation:all of the above.
They are simple molecules that can cross the plasma membrane by passive diffusion.
Answer:
Water
Explanation:
Water needs osmosis but the other 2 can easily cross - my textbook
Which of the following types of cells suppress immune responses?a. Neutrophilsb. Plasma Cellsc. Macrophagesd. Regulatory T Cells
Answer:
The correct answer is d.
Explanation:
Regulatory T-cells are a class of T cells which are part of the immune system that suppresses immune response. They are called regulatory because they assist in "checking" the excesses/overreaction during immune response.
NOTE:
Neutrophils are phagocytic in nature; they ingest and destroy microorganisms or other foreign molecules.
Plasma cells synthesize antibodies which are produced in response to antigens. They are target foreign particles for digestion by other immune cells.
Macrophages are also phagocytic in nature usually found at sites of an infection.
the all-or-none response of a neuron is similar to:
Answer:
The all-or-none law is a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.
The all-or-none response of a neuron is similar to a gun that either fires or doesn't. The correct option is B.
What is an all-or-none response?According to the all-or-none principle, signal transmission between neurons is solely dependent on the initial threshold being met rather than the stimulus's intensity.
In other words, neurons either fully or totally avoid transmitting an impulse via the synapse to the subsequent neuron.
According to the all-or-none law, the strength of a nerve cell's or a muscle fiber's response is not influenced by the stimulus's intensity.
A nerve or muscle fiber will activate if a stimulus is present above a predetermined threshold.
Therefore, the correct option is B. a gun that either fires or doesn't.
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The question is incomplete. The missing options are given below:
A. a dimmer switch that can provide a wide range of light.
B. a gun that either fires or it doesn't.
C. a fuse that cannot overload the circuits.
D. a match that doesn't always light when it is struck.
how Polar molecules can dissolves other polar molecules?
Explanation:
polar molecules do not have a symmetrical distribution of charge. one part of the molecule will be more negative and another part will be more positive which allows polar substances to dissolve each other.
Certain kinds of shells are always found in rock layers lower than layers with plant fossils. Dinosaur fossils show up only in layers above or with plant fossils what does this tell you about When these organisms lived
Answer:
This shows that once animals were on the surface there were plants for them to eat.
Dinosaur fossils show up only in layers above or with plant fossils. This shows that dinosaurs were animals that lived with plants and feed on plants.
What are fossils?Fossils are the remains of plants, animals, and other substances that are preserved under the layers of rocks and earth. They are the preserved form that gives the knowledge of organism present in before times.
Dinosaurs lived 65 million years ago, but still, their bones and remains are found on earth. They were found with the fossils of plants, so this tells us that plants were also present at the time of their presence, and they fed on plants.
Thus, only strata above or in conjunction with plant fossils do dinosaur fossils appear. This demonstrates that dinosaurs were also plant-eating and lived with plants.
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Bone does not amplify sound during speaking is _____________________
Answer:
Bone is a solid tissue, which resists a high impact of forces in its major axis.
The function of this fabric is not to transmit sounds, since it does not provide the elasticity, and the necessary elongation that is needed to generate the rope effect as in the case of muzzle cords.
Explanation:
The more rigid and less elastic the fabric is, the less sound it will transmit.
Sound strings, or mouth strings, are those that tighten, are flexible and resonate with different vibrations, in the case of bone tissue, sound vibrations are not influenced in their conformation because they do not have the ability to transmit them. .
The bone tissue, transmits impact forces or high newton levels, does not fulfill the function of transmitting vibrations and emitting sounds in terms of this type of vibrations and their frequencies.
3. Which people require knowledge of Earth science and chemistry in order to do their job? astronauts O chefs O artists O sound technicians
Answer:
astronauts
Explanation:
An astronaut is a trained personnel who is authorized to work for the spacecraft and works related to space travel. Academic subjects related to the study of the astronaut are electrical engineering, astrophysics, biochemistry, aeronautics, and geology. The astronauts' works are inclined towards performing experiments, launching satellites, and exploring the space.
Using the food web below determine how many omnivores are present.
what are the basic building blocks of fats?
Answer:
Fatty acids are the building blocks of the fat in our bodies and in the food we eat. During digestion, the body breaks down fats into fatty acids, which can then be absorbed into the blood. Fatty acid molecules are usually joined together in groups of three, forming a molecule called a triglyceride.