2. which statement best describes compounds?
a. compounds are collections of several atoms of the
same element.
b. compounds are made up of atoms of one or more
elements bonded together.
c. compounds rarely occur in nature and are often
synthesized by humans.
d. compounds are composed of atoms that are not likely
to react with one another.

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

d. planting trees

the trees take in carbon to make oxygen.