Answer:
B. Antibodies react specifically with an antigen.
Explanation:
Serological tests are blood tests that look for antibodies in your blood. They can involve a number of laboratory techniques. Flucculation tests are based on the precipitation that takes place when antibody and specially prepared antigens are mixed together
Regions containing metapopulations are created by the birth and immirgration of organisms to those regions.
We need to breath every day and hat just happens to be the amount of times we breath, but a human can actually breath up to 30,000 times per day it all depends.
Judging from what you have here the answer is letter A
