Through the use of the Polymerase Chain Reactions (PCR), small amounts of DNA

A. can pair with complementary sticky ends of cut segments.

B. can be amplified in volume to result in many copies of the segment.

C. can be cut in specific locations to isolate DNA sequences.

D. can be sorted and mapped.

B. can be amplified in volume to result in many copies of the segment.

Explanation:

The purpose of PCR is to amplify small amounts of DNA so that you can get a sample large enough to analyze (or use for some other purpose), especially in a crime scene. A. is referring to restriction enzymes, enzymes that cut at specific locations along DNA strands to create "sticky ends." C. is referring to restriction enzymes once again. D. is simply irrelevant.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.