Which of the following describes a possible relationship between a plant and an animal in an ecosystem? a. mutualism—both organisms benefit the same amount b. parasitism—one organisms benefits; the other is significantly harmed c. commensalism—one organism benefits and the other is not affected d. all of these

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.

gag reflex, poor dentition, gum retraction

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