What are two factors in the atmosphere that can change the shape of
landforms?

water action and wind action

Explanation:

There are two main causes of change to be mentioned here and they are water action and wind action. The processes used by these actions are known as Weathering and Erosion.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

the answer is c. it will give up it's valence electron to the other atom.