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?

Which pedigree symbol is used to represent a female carrier of a recessive x-linked trait? поө0 || save and exit submit

Which conditions need to be in balance for cells to function? check all that apply. blood sugar food intake body water body temperature body mass

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.