. If the Earth was the size of a basketball, about 24 centimeters in diameter, about how thick is the Earth’s crust?

the entire thickness of the ball’s diameter

the thickness of the leather covering and another inch (or 2.5 centimeters) below that

the thickness of the leather covering

6 centimeters thick, or half the radius

i think 25 centimeters but who knows

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: