What caused scientists to question whether Pluto was a planet? PLEASE ANSWER

Nwhat way does renewable energy differ from nonrenewable energy?

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.

Fertility and mortality rates are higher in more developed nations.