Which of the following statements best explains the relationship between eyes and depth perception?

The correct answer is B. Both of eyes see the images a little differently, because of the horizontal separation of the two eyes. This difference is proportional to the relative depth. Brain measures these differences and we obtain a stereo image of the objects that we see.

Explanation:

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a.   mass number from atomic number

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.