Which part of a cell is the gel-like fluid in which organelles move?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.

These are the components of the reservoirs of carbon that are exchanged in our environment.