Two-thirds of the earth's surface is covered by water. the water cycle includes these water sources evaporating and returning to earth as rain and snow. what is the driving force behind the water cycle?

The many volcanoes located along the edge of the pacific ocean make up the ring of fire. how does subduction play a role in the volcanic activity in the ring of fire?

Environmental impacts on evolution : mastery test

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?