40.1

 

an animal's size and shape are fundamental aspects of form thta significantly affect the way the animal interacts with his environement. 

 

evelution:

many different body plans have arisen during the course evolution, but these variations fall within certain bounds.

the nature changes. this is because of natural selection. 

natural selection often results in similar changes  when diverse organisms face the same challenges.

such as overcoming drag (weerstand) during swimming.

 

physical laws also influence animal body plans with regard to maximum size: