The force that contributed to the formation of planets, determines the motion of bodies in the solar system, and pulls objects to the center of Earth is called gravity
.

The principle that states that an object at rest will stay at rest and that an object in motion will stay in motion is the law of
inertia
.

Image result for The principle that states that an object at rest will stay at rest and that an object in motion will stay in motion is the law of inertia

The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Explanation:

answer; ///i believe that the correct answer is (a) specialized cells)