When is genetic drift a major factor in evolution?
O
A. When there is male choice
O
B. When there is high selective pressure
O
c. When there is directional selection
O
D. When there is a bottleneck
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The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.

Which organelle plays a role in intracellular digestion?