In which of the following examples is the farmer utilizing a method of erosion prevention?
a. planting crops repeatedly, without putting nutrients or fertilizer back into the soil
c. allowing cattle to feed in an area until very little vegetation remains
b. planting crops in patterns to reduce water run-off
d. removing soil from a location, and placing it in a water source

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

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?