Because the earth has only a fixed amount of carbon, it is important that it gets recycled through the

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

meiosis is the correct answer

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms