Definition: these are physical features shared by organisms with common ancestry; they may have the same structure, but different functions developmentally mature organisms.

The number of living organisms in a particular area is

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.