Long ago, rats were common inhabitants of ocean-going ships. Imagine that rats from one town in Norway hitched rides on three different ships. Ten years later, most rats on the Ninã were brown; on the Pinta, black; and on the Santa Maria, white. This reveals the effects of which specific mechanism of microevolution?

Name the part of the the brain labeled "e".

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring