Which best explains why an electric toaster is considered a resistor? It increases the flow of electrons.
It acts as a conductor.
It converts electric energy to another form of energy.
It produces an increase in voltage within the current.

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:

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome