It's some change in the conditions around the organism, which the organism can detect and respond to. A change in temperature, more light, or something physically poking the organism are examples.
The moon that is the answer to your question
<span>c. only the fittest of sperm and egg combinations will survive.
</span>As opposed to external fertilization, internal fertilization ensures that
NOT:
a. the number of sperm and eggs produced will be equal.
b. all of the sperm will fertilize eggs.
d. sperm will be protected until they can unite with the eggs.
<span>e. sperm and egg will be released simultaneously.</span>
