Which of the following factors was key to the formation of the first civilization in the nile river

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.

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.

Why is immigration so important today?