What are the factors affecting physical development?

3 answers

http://www.google.com/search?q=factors+affecting+physical+development&rls=com.microsoft:*:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7ADBF_en-US

Ignore the ones that refer to social development. The others look promising.
I mean, what are the factors affecting physical development in childhood and adolescence? Sorry, I was not able to state it clearly.
* genetics
* food
* pollution or lack of pollution

...and many others.

What do you think?