Egener’s theory of says that land masses move slowly.

The chemical form of energy that is useable by the cell to do work

What advantages does a pedigree have over a written passage?

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