Is not math is english

Okay, Lihle. I see you're working on English.

The question asks you to identify the process that releases carbon dioxide and the one that uses it up.

• Respiration is the process where living organisms break down food to release energy, and carbon dioxide is a byproduct that is released into the air.
• Photosynthesis is the process used by plants and other organisms to convert light energy into chemical energy. During this process, plants take in carbon dioxide from the air and use it to create food.

So, to answer your question:
a. Respiration gives off carbon dioxide into the air.
b. Photosynthesis uses up carbon dioxide in the air.