2. Which organisms make carbon dioxide in the atmosphere available for all living organisms in
the ecosystem?

Photosynthesis by land plants, bacteria, and algae converts carbon dioxide or bicarbonate into organic molecules. Organic molecules made by photosynthesis are passed through food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.

Explanation:

land plants, bacteria, and algae

Explanation:

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products