Some chemicals increase the mutation rate, physical agents such as radiation also increase the mutation rate. There are viruses that are mutagens as well. Also, the number of mutations that an organism produce can also be phenotypically plastic.
Hope this helps. (This is the definition my bio teacher gave me.)
B. by the sharing of electrons
Answer choices A and C are incorrect because covalent bonds form as a result of electrons (protons are kind of irrelevant). Answer choice D is incorrect because it describes an ionic bond.
Further study topics: water polarity, hydrogen bonds, free radicals, valence electrons, and more!
Answer:
MULTICELLULAR-means many cells whereas UNICELLULAR means one cell
Explanation:
The possible evolutionary explanation for death is that an organism which was less adapted to its environemnt will die out sooner than will the one that was adapted more to it. Another possible way of thinking is that each organism has to die in order for his offspring that will likely be slightly more adapted to the environment to live on.
Because there are not strictly green and yellow plants, this means that the color can be affected by multiple genes. If it was only affected by one gene then you would see only the two groups for the color, green and yellow. The answer is D.
