How do the amounts of green
pigment, chlorophyll, differ from summer
to fall?

In summer the green pigment is more than in tall meaning that there is more chlorophyll produced in the summer than in the fall

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.