Besides supporting and protecting a cell, the cell membrane __ what enters and leaves the cell? ?

How do chloroplasts set plants apart from other living things

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.

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from