A person contracts the AIDS virus through a blood transfusion. The infection activates his TH cells, which begin to attack the virus. Soon his TH cell levels begin to decrease, resulting in decreased immune system function. Why does this occur?

answer; the correct answer is (beta)

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.