Which statement correctly describes magnetic field lines?

A. They form loops by joining north pole to south pole.

B. They are parallel with one another.

C. They show the direction a south pole will point.

D. They form loops by joining positive charge to negative charge.

What is an electric motor? explain its operation. 2-3 sentence

During the apollo moon missions, astronauts were concerned about the effects of newton's third law of motion when: o a. they ejected waste water, because they were concerned that it would push them off course. o b. they reentered earth's atmosphere, because they were carrying heavy moon rocks. o c. they took off from earth, because a large force was required to generate large acceleration. o d. they detected incoming space debris, because the inertia of the debris could damage their ship.

The receptor cells that convert light energy into neural signals are called