Power is measured in:

a)
j/s

b)
j2/s

c)
s/j

d)
s2/j

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:

so easy. just google the electromagnetic waves and it’ll pop up.