Test-crashing spaceships or satellites would be really expensive. Could scientists use the information they know about motion and travel on Earth and apply it to objects in space? Do
the same concepts we've learned about apply in Space the same as they do on Earth?

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

he made 11 calls in one day

cant without the picture! ?