What is found in many tetrapods but not in fish?

A)Tetrapods were no longer tied to the water for reproduction. B) Tetrapods could now function with just lungs.

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