How Does Gravity Affect Organisms' Size and Habitat Adaptations?

[Biologik]

Why do we grow to the way we are. Are we averaged size because of average gravity. If this planet had gravity equivalent to Jupiter, would be have been shorter, like a snake, and flatter? Why can organism live in certain places like volcanoes? Wouldn't they have had to live there long enough to adapt to it, and if so, how did they start living their without dying?

 

[Monique]

That's not a question, but a whole list of questions. I don't know why you ask why we grow the way we are and what you mean by average size, live on Earth is very diverse: there are small organisms such as ants, or huge ones such as whale sharks (which in turn lives on the microscopic plankton).