What is meant by "anthropogenic greenhouse gases"? answer?

Needed fast 15 points the process of natural selection favors certain characteristics in organisms, while it selects against other characteristics. what would happen if there was zero variation between all of the organisms on earth? a.organisms would evolve to increase variety b.natural selection would operate faster c.less food would be available d.evolution through natural selection would not occur

Ahill is made of rock particles of different sizes. which of these agents of erosion probably caused the hill to form?

Choose the correct chronological or of the time periods