These skills allowed humans to harvest more of the sunlight than was possible through glycolysis alone, and human population began to grow.

They are reasonably confiding and often allow humans to approach quite closely before moving off.

Culture and symbolic language, once developed through evolution, allow humans to race ahead.

First, anger is a normal process that has allowed humans to evolve and adapt.

This ability allowed humans to become efficient hunters and to exploit a wide variety of game animals.

Eventually, the advances in the two fields allowed humans to fully map out the human body.

Because she has to allow humans to be human, even now.

Dulbecco's discoveries allowed humans to better understand and fight cancer.

Higher ground allowed humans to carefully observe the horizon to mark and measure astronomical events.

He realized that to allow humans to war would leave no kingdom for him to rule.