1. Oxygen molecules taken in per breath: The athlete's result will be
higher than
the normal healthy
body's result.
Why?

Explanation:Oxygen molecules absorbed by cells: The athlete's result will be  

the normal healthy body's result.

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

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