The out-of-Africa model states that Homo sapiens arose from a single population in Africa about
____________________ years ago. Fill in the blank(s) with the appropriate word(s).
ANS: 200,000
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Destruction of which biome would result in the greatest loss of biodiversity?
A. desert B. grassland C. savanna D. taiga forest E. tropical rain forest
A mechanism shared by both extracellular and intracellular digestion is
A. the ability to phagocytose food particles. B. a slow speed of digestion. C. the presence of a digestive cavity. D. the ability to consume both large and small food items.
Which mechanism allows certain viral pathogens to evade the vertebrate immune system?
A. becoming a symbiont B. becoming nonvirulent C. frequent changing of surface antigens D. becoming metabolically inactive E. becoming a spore
The change in frequency of traits in a population is known as _____________
Fill in the blank(s) with the appropriate word(s).