What evidence do fossils provide for how life has changed throughout Earth's history?
Answer:
Fossils document the existence of now-extinct species, showing that different organisms have lived on Earth during different periods of the planet's history. They can also help scientists reconstruct the evolutionary histories of present-day species.
Explanation:
Hopes this helps!
Why is evolution considered a theory
A. It is backed up by scientific evidence
B. It cannot be proven
C. It is a guess about what happened
D. It was proposed by a scientist
Answer:
It's because it can only be proven by scientific evidence
Please help!!!
Which structure is smaller?
A. Chromosome
B. Histone
C. Nucleosome
Answer:
B. Histone because they are a family of small positively charged proteins.
i need help with this have to have it turned in by 3
Which of these statements best describes a niche in an ecosystem?
the role of a species in its community
the role of a species in its population
the way a species uses the resources in its habitat
the way a species interacts with other species in its habitat
how is specialization beneficial for an organism
water is a polar compound because it exhibits____charges
Answer:
I think it is negative charges
Explanation:
hope this helps :)
Memories about one's own life are called:
self-recall
historical memories
myopic visions
autobiographical memories
What is the final product of transcription?
A gene
An amino acid
An mRNA molecule
A stop code
here is the paragraph to read from:
Transcription is the process by which an RNA copy of a gene sequence is created. This copy, known as the mRNA, travels from the cell nucleus to
the cytoplasm. There, it directs the synthesis of the protein. The base code in the mRNA controls the order of the amino acids in the protein.
There are 20 amino acids used to make proteins and different codes for each acid. The tRNA reads the code. Then it brings a specific amino acid to
attach to the growing chain of amino acids. Each tRNA carries only one type of amino acid. It only recognizes one specific code. tRNA is released
from the amino acid until it comes to a stop code. Then the protein is set free from the ribosome.
Answer:
An mRNA molecule
Explanation:
Transcription is a process by which the information stored in a specific fragment of DNA called 'gene' is used to produce a complementary RNA molecule, usually a messenger RNA (mRNA). Subsequently, this mRNA is used as template to produce a polypeptide chain (i.e., a sequentially ordered amino acid chain) through the process of translation. A stop codon, also known as termination codon, is a triplet of nucleotide bases within an mRNA that signals the end of the protein when it is synthesized in the ribosome. There are three stop codons (UAG, UAA, and UGA) that are capable of stopping protein synthesis.
What is a gene? HELP PLEASE
Answer:
Option A is correct
Explanation:
Gene is the basic unit of heredityGene is actually a sequence of nucleotides in the DNA.Termed by JohanssonPart of DNA having information for translationLinearly arranged on the chromosome.Present on a particular locus on the chromosome.Every person has 2 copies of each gene, one inherited from each parent.A few years ago, the labels from one class section's experimental treatments plants fell off in the greenhouse and got swept away! One group was the only group in the section to test the effects of indole acetic acid (IAA) on bean plants. The IAA group applied lanolin paste to one side of their bean stems. What should they look for in order to identify their experimental plants from other groups
Answer:
The group needs to find signs of apical dominance, growth in response to light, vascular tissue differentiation, formation of lateral and adventitious roots, etc.
Explanation:
Lanolin is a solvent used to study physiological processes in plants by diluting hormone growth regulators (in this case, indole acetic acid). Indole acetic acid (IAA) is the most important auxin hormone in plants. Auxins are essential plant hormones synthesized in expanding shoot tips that move down the stem to the roots. These hormones coordinate cell division, elongation and identity during plant body development. IAA hormone is well known to regulate different plant developmental processes including, among others, apical dominance (where the central stem grows more strongly than other lateral stems), tissue differentiation, stem elongation, phototropism (growth in response to light) and gravitropism (response to gravity). For instance, under the application of IAA, it is expected that bean stems grow to imitate the response to light (phototropism) by bending away from the side where lanolin was applied.
Two protein kinases, PK1 and PK2, work sequentially in an intracellular signaling pathway.You create cells that contain inactivating mutations in the genes that encode either PK1 or PK2 and find that these cells no longer respond to a particular extracellular signal.You also create cells containing a version of PK1 that is permanently active and find that the cells behave as though they are receiving the signal even when the signal is not present.When you introduce the permanently active version of PK1 into cells that have an inactivating mutation in PK2, you find that these cells also behave as though they are receiving the signal even when no signal is present.
A.From these results, does PK1 activate PK2, or does PK2 activate PK1? Explain your answer.
B.You now create a permanently active version of PK2 and find that cells containing this version behave as though they are receiving the signal even when the signal is not present.What do you predict will happen if you introduce the permanently active version of PK2 into cells that have an inactivating mutation in PK1?
Answer:
a. PK2 activates PK1
b. no response would be produced
Explanation:
Kinases are enzymes known to phosphorylate different substrates, thereby activating/inactivating them. In this case, a mutation that produces a constitutively (permanently) active PK1 kinase is itself able to continue the signaling pathway, independently of whether or not PK2 is present. This constitutive mutation shows that PK1 is recruited to continue signaling events within the cell and, therefore, PK1 activation is downstream in the signaling pathway. Conversely, cells containing active PK2 and inactive PK1 would be unable to continue the signaling pathway since PK2 activation is upstream of the induction of PK1, and thereby these cells cannot respond to the signal (PK2 activation).
A hypothesis is a proposed explanation for an observation, which can then be tested with experimentation or other types of studies.
a. True
b. False
Answer: True
Explanation: Hope this helps! Correct me if it is wrong!
Definition: This is an organism's response to a stimulus developed by being taught or watching another organism. Example: how to open a soda when you're thirsty
Cell homeosyasis virtual lab
Answer:
ok where's the lab and how can i help?
Explanation:
What is happening to glaciers over time. What is causing the change?
The greenhouse is the cause of most climate warming and glacier retreat in the past 50 years, however, related causes like farming, burning fossil e.t.c are also causing glacier retreat
the number of molecules of ATP produced from one molecule of glucose through glycolysis/oxidative phosphorylation is respectively
Answer:
Glycolysis is the answer
Answer:
Explanation:
Glycolysis starts with one molecule of glucose and ends with two pyruvate which is pyruvic acid. molecules and a total of four ATP molecules, and two molecules of NADH.
What do motor neurons do? URGENT FOR SCIENCE 20 POINTS!!!!!!!!!!!!!! BRAINLIEST
Answer:
neurons transmit impulses from the spinal cord to skeletal and smooth muscles (such as those in your stomach), and so directly control all of our muscle movements
I think...............
Answer:
"Motor neurons of the spinal cord are part of the central nervous system (CNS) and connect to muscles, glands and organs throughout the body. These neurons transmit impulses from the spinal cord to skeletal and smooth muscles (such as those in your stomach), and so directly control all of our muscle movements."
Explanation:
G o o g l e helped me answer your question, I hope this helps with your science.
what is depolarisation
Answer:
Depolarisation refers to a sudden change in membrane
potential – usually from a (relatively) negative to positive
internal charge. In response to a signal initiated at a
dendrite, sodium channels open within the membrane of
the axon.
how do specialized cells relate to the different levels of organization in a multicellular organism?
Answer:Specialized cells perform specialized functions in multicellular organisms. Groups of specialized cells cooperate to form a tissue, such as a muscle.
Explanation:
What is a Beaver’s tail used for
Answer:
The tail is used as a rudder in swimming, as a balance prop while working on land and to signal danger when slapped on the water. Beavers will also store fat in their tails, eating more in the fall so they can survive off the fat stored in their tails through winter if food is not available.
Explanation:
12. Individuals with Type O blood are able to produce both Anti-A and Anti-B antibodies, while individuals with Type AB blood produce neither of these antibodies. Explain why this is the case. How does this relate to the idea that people with Type AB blood are often referred to as universal recipients for transfusions
Answer: Blood group O individuals are able to produce Anti- A and Anti- B and are often referred to as UNIVERSAL DONORS, while blood group AB individuals produces none and are often referred to as UNIVERSAL RECIPIENTS
Explanation:
Two antigens, type A and type B, occur on the surfaces of the red blood cells in a large proportion of human beings. These antigens are referred to as agglutinogens because they often cause blood cell agglutination during blood transfusion. Because of the way these antigens are inherited, people may have neither of them on their cells , they may have one or they may have both simultaneously.
When type A antigen and type B antigen is not present in an individuals reb blood cell as seen in blood group O, antibodies known as Anti-A and Anti- B develops in the plasma. This is because small amounts of type A and type B antigens enter the body through food, bacteria and other ways and they initiate the development of anti A and Anti- B antibodies in their plasma.
Furthermore, individuals with blood type AB has antigen A and B on their red blood cells and therefore do not develop antibodies A and B in their plasma. This makes them universal recipient as their blood do not discriminate any ABO blood group during blood transfusion.
If a lysosome erupts, it will digest the cell and all the organelles.
True
False
How would the changes that occur to water when it is boiled be
best described?
Choose one:
A: a chemical change
B: physical change
C: both of them
D: niether of them
Answer:
I think the answer would be C.
Explanation:
Answer:
The answer is C.Both of them
help pleasee
Many plants produce seeds which have small hooks on them. These hooks will attach to animals as they
move past the plants. What process do these hooks help the plant with?
A. pollination
B. fertilization
C. germination
D. seed dispersal
Answer:
A. Pollination
Explanation:
Because the "Hook" is helping the "Seed" get to other places to grow.
Why human cell is consider as eukaryotic cell where as bacteria cell as prokaryotic cell?
One of the biggest sources of greenhouse gases released into the
atmosphere is emissions from burning fossil fuels. How could carbon
sequestration help alleviate problems associated with burning fossil fuels?
A. It could make fossil fuels a clean-burning energy resource.
B. It could prevent carbon dioxide from being a greenhouse gas.
O C. It could prevent released carbon dioxide from entering the
atmosphere.
D. It could make fossil fuels a renewable energy resource.
Answer:
The correct answer is - B. It could prevent carbon dioxide from being a greenhouse gas.
Explanation:
Carbon sequestration is the process that involves capturing and removal of atmospheric carbon dioxide from the atmosphere and prevent it from changing climate by increasing global warming as carbon dioxide gas traps the heat.
It is helping in the removal of excess carbon dioxide from the atmosphere and prevents it from being a greenhouse gas and increase global warming. It could be geological or biological.
Answer: C- it could prevent released carbon dioxide from entering the atmosphere
Explanation: ap3x
Miss treatment or blank is defined as any action that inflicts pain suffering or injury
Mistreatment or ill-treatment is defined as any action that inflicts pain, suffering, or injury.
Fill in the blanks on the table with the names of the atmospheric layers, their chemical
compositions, temperature trends, and aircraft needed for travel. (10 points)
Answer:
Hope this helps
The atmosphere of Earth is composed of five different layers namely exosphere, thermosphere, mesosphere, stratosphere and troposphere.
Different layers of the atmosphere have various functions are located at different temperature and pressure regions.
The correct answers for the blanks are attached in the image below:
To learn more about atmospheric layers follow the given link:
https://brainly.com/question/12117482
While Rebecca at her locker she can hear students coming from around the corner. Which wave interaction explains why she can hear them
Answer:
Diffraction
Explanation:
Diffraction is the key explanation why we can hear sounds around corners but not see them. As compared to light waves, sound waves have much longer wavelengths, making diffraction effects much more visible. When the size of the object that the wave is diffracting around is about the same as the wavelength of the wave, diffraction effects become very visible.
Sound has a wavelength of 1 m, while light has a wavelength of 0.1 micro m. Reflection is a secondary reason. Sound waves bounce off walls in a specular way, allowing them to bounce around corners, but light bounces off walls in a diffuse manner.
hope this helps :)