Plants and algae need along with sunlight and carbon
dioxide to make their own food.
PLZZZ HELP MEE

Water

Explanation:

This process is called photosynthesis and is performed by all plants, algae, and even some microorganisms. To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"