True or false: when an organism practices external fertilization, many offspring, often millions, are produced in order to enhance chances of survival.

The given statement is True.

When an organism practices external fertilization, many offspring are produced so as to increase the chances of survival of the offspring. There are chances that the predators may eat the eggs or the spring present outside.

There are chances that the eggs may not be fertile or can be destroyed by any means.

So, the organisms that posses external fertilization produce many offspring, often millions to increase the chances of survival.

the answer to your question is:

c. complementary base-pairing