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?

the correct answers are;

a. the rock was made from more than one type of material.

e. layers of hot liquids in the rock cooled and solidified at different temperatures.

these are the two options that are related to the statement given above.

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.