Gerry is listing all of the conditions under which natural selection occurs. So far, she has listeck The environment changes
2. Organisms in a population have different traits
Which other condition should she include in her list?

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

the answer you are looking for is the united states forest service.

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.