I was walking around my house this afternoon looking at all the plants blossoming in the spring. I was thinking to myself why do plants have to grow? I was thinking that plants have enough to suport them selves in their earilest stage they really can survive in teh same state for ages with out change so what prompts them to grow? just cuz they can? But this is anatomy and human Bio. So why do WE grow as humans? After we have grown to about the size of a 3 year old we can support ourselves (not in brain power ofcourse) but our body can matain itself with no problems They human race would be perefectly fine staying 3 feet tall and weighing 100 pds. What is it that makes us grow and why do we do it?