All living organisms contain carbon atoms. which of the following is an important characteristic of carbon?
carbon atoms can bond with any other atom, but they cannot form bonds with other carbon atoms.

carbon atoms can bond with many other kinds of atoms to form very stable molecules.

carbon atoms are highly reactive and form unstable bonds with any available atom.

carbon atoms are very stable and do not easily form bonds with other atoms.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.