Which age pyramid has the largest base of pre-reproductive population ?

Describe the structure of a virus, and explain how this structure differs from that of a cell.

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?

Mrs. dodge's class is studying minerals. mrs. dodge wants her class to complete a test to find out the color of minerals found in certain rocks. which test does mrs. dodge want her class to complete? a) smell test b) taste test c) streak test d) hardness test