Question

Trees absorb carbon dioxide and exhale....that is essential for all humans and animals.
a. carbolic acid
b. oxygen
c. potassium
d. calcium
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Answer 1

Answer:

(B) O2 oxygen

Explanation:

Trees absorb carbon dioxide and exhale Oxygen   that is essential for all humans and animals.

Answer 2

Answer:

Photosynthesis and respiration are the two essential processes that allow life to sustain on earth. In a way, they are a cycle — plants help humans breathe by providing us with oxygen, and humans help plants "breathe" by providing them with carbon dioxide.