How does classroom temperature affect students’ performance on a test? Hypothesis:
Independent variable:
Dependent variable:
Control variable:

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

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

_is a product of the first stage of photosynthesis. atpglucosecarbon dioxidewater