Question

What process is directly responsible for growth in living organisms?

Answer 1

Answer: I can think of a few answers they may be looking for-

Mitosis (most likely)

or

The release of growth hormone

Answer 2

Answer: mitosis

The increase in size and changes in shape of a developing organism depend on the increase in the number and size of cells that make up the individual. Increase in cell number occurs by a precise cellular reproductive mechanism called mitosis.