The energy needed to get a reaction started is the a. enzyme energy b. activation energy c. catalyst energy d. chemical energy

answer; i believe the correct answer to the above question is ( friction)

a and c are the answeres

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.