Natural selection occurred due to environmental conditions, as well as human preferences.

Further selection occurs due to the birth interval for a single female averaging 2-2.5 years.

A basic question in psychology is when this selection occurs.

Negative selection can occur at the double positive stage in the cortex.

"But how can natural selection be occurring in a population of hermaphrodites?"

Her selection to the senior national softball team occurred in 1987.

Natural selection occurs at every life stage of an individual.

This selection occurs through the Law School's writing competition and students' academic performance.

And while rare, selection can occur on genes within an organism.

In order to home in on the desired information, some selection must occur.