Two carts connected by a 0.50 m spring hit a wall, compressing the spring to 0.25 m. The spring constant k is N
200
m
What is the elastic potential energy stored from the spring's compression?
Khan aced my?

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:

i think the answer would be b

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.