Which timeline shows the correct order of contributions made to the discovery of DNA? ( )DNA discovered, DNA studied with X-rays, Human genetic code decoded, 3D model of DNA developed
( ✓ ) DNA discovered, DNA studied with X-rays, 3D model of DNA developed, Human genetic code decoded
( )DNA discovered, 3D model of DNA developed, DNA studied with X-rays, Human genetic code decoded
( ) DNA discovered, Human genetic code decoded, 3D model of DNA developed, DNA studied with X-rays

the second choice is the correct one

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.

Some species of wasps are social. the queen starts a colony from scratch each spring. she builds a small nest, and lays and raises a group of female workers. the workers enlarge the nest while the queen continues to lay eggs. unfertilized eggs become males that mate with newly hatched females. all of the wasps except the newly fertilized females die by the summer. which best describes this behavior? a)it is beneficial only to the males that do not fertilize eggs. b)it is beneficial only to the female workers that are not fertilized. c)it is beneficial to each one of the individual colony members. d)it is beneficial to the whole species, but not to all of the individual members.

One student group hypothesized that the dry baker's yeast must be alive.the temperature change, odor, and bubble foation, they said, indicated whych characteristic of life