Answer:
Population- This is why we refer to the amount of people in an area as the area's population
Matter is anything that takes up space. Your mass determines how big, or small you are. Or, how big or small something is. Matter is in everything. Even air has matter. Humans are made of matter. Matter makes up atoms, carbon, cells, and everything else you can think of. (Except ideas)
B. Resistance is the tendency for materials to oppose the flow of electric charges.
He ability of a stream to erode and transport materials is largely based on its velocity.
