The size of a food web is limited by the number of a) detritivores. b) primary consumers. c) primary producers. d) top level predators.

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

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