Polymerase chain reaction was developed so that scientists could
a. compare the dna fingerprints of different people.
b. create corn plants that product the bt toxin.
c. replicate a gene without using bacteria.
d. choose organisms with desired characteristics for breeding.

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

this was from the link provided:

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.