They argue that energy was diverted from biological reproduction during a period when climate irregularities favored small families.

This caused the Mariposans to turn to cloning instead, strongly rejecting biological reproduction, and as a consequence, any sign of intimacy.

Is it necessary to understand the complex miracle of biological reproduction in order to observe that a hen lays eggs?

As a crude approximation, the chemicals mimic biological reproduction.

This behaviour goes beyond simple biological reproduction.

Offspring is the product of biological reproduction.

He was an early researcher into the science of biological reproduction.

A unit of biological and social reproduction, the family needs no sense of history or of life in order to perpetuate its structures.

In adoptions, just as in biological reproduction, there are many wild cards and no guarantees.

"Of course there's the biological imperative toward reproduction," said Ruthie.