What is a chromosome? O A colorful DNA
O A portion of DNA
O A broken DNA
O A sequence of DNA
O A piece of DNA
O A bundle of DNA

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Darwin’s hypothesis about how life changes over time is now called?