The number of chromosomes that results in a cell made by "c"

Compare the composition of the moon's surface with the composition of the earth's surface.

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems