research historical and present ecosystem services in tonle sap. what services depend on size and timing of annual floods? how have human activities affected those in the past

Explanation:

A floods timming is affected

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