What is cyclic about the reactions that make up the krebs cycle?

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

easy

explanation:

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.