What is the enormous desert that stretches across north africa?

Ais a survey that focuses on only a small portion of the population, and the results are generalized for the larger population.

Why are shark population in decline worldwide?

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.