Biologists began to see female sexual behavior with new eyes.

During the late 1950s biologists began to study the nature of art in humans.

After the lake fell 40 feet, environmentalists and biologists began to fight the city.

During the 1890s several biologists began doing experiments on breeding.

So biologists began working on a plan to identify how to keep a habitat healthy.

Biologists began to take note of Monteverde in the 1960s.

Biologists began to study the embryonic development and differences in individual organisms.

The biologist had only begun to react when the bullet snapped his head back.

As biologists have recently begun to understand, the body's cells are not inherently mortal.

Biologists have also only begun to understand how living creatures measure and regulate temperature.