What locations serve the most limited population of individuals?

In a scientific experiment, a is any factor that can be changed or be changed

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.