Gaps in rock layers are called a. unconformities c. half-lives b. index fossils d. none of the above select the best answer from the choices provided a b c d

It's unconformities. So A is correct.

a. unconformities

Explanation:

Uncinformity is a geological disturbance. It can be found as a gap between the rocks due to the deposition of sediments inside the rocks. The rocks which exhibit unconformity are generally younger than the one buried below.

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'