Anyone know the answer- When does puberty occur? What causes the changes that occur during puberty?

Which of the following are energy solutions that release pollution into the air>

What happens whenever a net force acts on an object

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.