Antigen receptor diversity in lymphocytes is due to . Multiple choice question. an unlimited number of genes predetermined genetic rearrangement events inherited, predetermined genes random genetic rearrangement events

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.