Answer: A. mechanisms for which activity is primarily triggered and shaped by the incoming stimulus information.
Explanation:
Bottom-up mechanism is a process in which a body perceives an incoming stimulus and certain physiological changes occurs in the body working in the direction of upwards that is the signals are transferred to the brain so that the brain could interpret the stimulus. This mechanism suggests the fact that our perceptual experience is based upon the sensory stimuli.
Answer: Giving birth only in the spring and summer ensures that offspring are born when food is most available.
Explanation:
The unique - tertiary structure of the enzyme is what makes it unique - this in combination with the receptors at the active site confer specificity.
A hypersensitive reaction to a specific antigen in the environment is a(n) _ALLERGY_.