Why is it important to state a conclusion

The answer is A.

A conclusion is to restate the main argument. "To clearly state why the experiment was performed" is the closest to summarizing the point of the "main argument".

the answer is c.) there is a warm front in region a and a stationary front in region b.

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