Answer:
The test cross is shown below
       T         T
t      Tt         Tt
t       Tt         Tt
The alleles shown in the vertical side (tt) are recessive and come from the male parent. The alleles TT are dominant and come from the female parent.
For the variety of offsprings to be 100% tall, the recessive parent had to be crossed with a homozygous dominant parent.  If the female was heterozygous with which the cross was done,then there would be small tomato plants in the offspring generation. 
 
        
             
        
        
        
It is useful for an ecologist to identify the keystone species in an ecosystem because the keystone species is important to maintaining the stability of an ecosystem, and any changes in the keystone species population shows that there is changes in ecosystem health.
 
        
             
        
        
        
Answer:
i don't know if im right but honestly i could be A B or C
Explanation:
but i would say if its humans adapting to the environment and if an animal probably the same thing but maybe A more than C 
 
        
             
        
        
        
Answer:
beginner at this what he proves to be true