Diffusion , the movement of gas molecules .
Yes, because even though other trees produce more oxygen, the small trees will still produce some oxygen. On top of this there are more small trees than big trees, so even though they make less oxygen, in whole they end up making more when added together!
The answer is C because it’s something that can be caused by speciation, not can cause it
We can’t see the picture :(
Maybe post another question but with the picture
