Which organism would be the best subject for a study of both photosynthesis and cellular respiration?
a green plant
a chemosynthetic bacterium
an animal that eats plants
an animal that eats animals

a green plant

Explanation:

Green plants use photosynthesis and cellular respiration to obtain energy.

A green plant would be the best subject for a study of both photosynthesis and cellular respiration?

Explanation:

We can refer to green plants as the wide collection of photosynthetic organisms that all contain chlorophylls a and b which are stored as starch.

Green plants make use of photosynthesis and cellular respiration when obtaining energy.

Looking at option A to D; only the green plant fits into the question because animals do not photosynthesise (photosynthesis is only applicable to plants) and chemosynthetic bacterium cannot undergo respiration.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

d. planting trees

the trees take in carbon to make oxygen.