Many different populations of marine life live at a coral reef. this is an example of which of the following? a. ecosystem diversity b. genetic diversity c. natural selection d. species diversity

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

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.