Which of the following statements accurately explains how earth’s atmosphere supports life?
a. earth’s atmosphere contains 78 percent oxygen, which is essential for life.
b. earth’s atmosphere contains 21 percent oxygen, which many life forms need to
survive.
c. earth’s atmosphere contains more oxygen than carbon dioxide.
d. earth’s atmosphere contains carbon dioxide, which all life forms breathe in.

the answer is B.

Explanation:

you may have thought that the answer is a but that is false information and C. and D. are completely wrong

B  i know because i looked it up and my first answer was wrong

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