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i dont know either, we're probably doing the same homework
its called homeostasis. ;)
A response is an action of change in behavior that occurs as a result to a stimulus. The stimulus can be either internal or external.
external
Any internal or external change that brings about a response is called a stimulus. As a key homeostatic regulatory and coordinating system, the nervous system detects, interprets, and responds to changes in external and internal conditions.
Both, for the bug to exhibit an external change (its color), there must first be an internal change that triggers the color change (its color). Thus, the internal change facilitates the external change. The predator is an external factor that causes an internal reaction (maybe it's fear) in the bug, that internal reaction then triggers an external factor which is the change in color. Just a personal opinion.
Motor neurons of the nervous system are what innervate muscles and glands.
Internal variables are those that are within the control or influence of the system or entity being studied, while external variables are those that are outside of its control or influence. Internal variables are typically more easily manipulated in an experiment, while external variables are often more difficult to control for.
external because they can change over time.
exothermal
A stimulus is a change inside or outside your body that brings a response.
yes.