Plants use the carbon dioxide in photosynthesis and produce oxygen for humans. What type of symbotic relation is this?

Mutualism

Explanation:

both humans and plants benefit from it because we breath out carbon dioxide

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