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is a group of species that includes a single common ancestor and all descendants of that ancestor, living and extinct.

the answer will be a) proteins i believe

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

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.