What north african country was 1st to domesticate animals

The organ that has two atria and one ventricle is the

The coco river is a natural border between nicaragua and which other country

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.