Which of the following sentences from the section "San Andreas Unleashed" BEST develops a CENTRAL idea of the article?

¿cual es mas alta en baja california,la migracion o la inmigracion?

The largest internal organ in the frog is the

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.