Neither follicle stimulating (fsh) hormone nor testosterone alone can stimulate significant sperm production, whereas when they act together, the testes produce some 300,000 sperm per minute. this is an example of which principle regarding hormones?

The synergistic effect

Explanation:

The synergistic effect of hormone can be defined as the phenomenon in which presence of one hormone is required for the working of another hormone to show its full effect on the target cell.

In endocrinology the hormones can work antagonistically or synergistically in order to increase or decrease the effect of hoemones.

Here, FSH and testosterone works together to show the effect.

the fossil record provides evidence of a common ancestor to many species.