Which structure transfers sperm from male to the female during sexual intercourse?

it creates acid rain

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

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