How do objects keep their orbits in space?

Gravity

Explanation:

Gravity keeps things together. Think of it in 2 ways:

1.Without gravity, an Earth-orbiting satellite would go off into space along a straight line. With gravity, it is pulled back toward Earth.

2.Gravity keeps the earth round, pushing it on all sides, which is what gives it its round shape.

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.