Answer:Margulis
She is the one who discovered it
 
        
                    
             
        
        
        
Answer:
Fur color that closely matches the eucalyptus bark color
Explanation:
In terms of evolving from land dwellers to tree dwellers, the number of offspring does not matter. Although the ability to run faster is a good evolution for escaping predators, it does not help the koalas evolve to be better tree dwellers (how would you run using only the trees?). Communicating with their peers would be convenient for survival, but it does not help koalas become better tree dwellers. What does help koalas survive better by traveling through the trees is camouflaging with the bark of the tree to hide from predators. 
 
        
             
        
        
        
A predator of that fish. Or if the fish can only lay eggs in an environment with current. Also temperature can effect if it will survive or not.