The major organ of the circulatory system, the heart

Group of answer choices

1:transmits impulses throughout the body.

2:carries oxygen throughout the body.

3:removes bodily waste.

4:pumps blood throughout the body.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

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.

Which are reasons cells undergo cell division?