Other contributors have said "How come animals camiflarge?" is the same question as "How come animals camouflage?" If you believe that these are not asking the same thing and should be answered differently, click here
Animals eat other animals because they are carnivors, herbavors eat just palnts/crops and omlivors eat both aniamls and plants/crops. But we can't help it because it's passed down from mother to baby...
Most labs breed their own lines so that they can keep a consistent gene pool for their studies. In doing this, there is no extraneous variable with a different line of animal. If they do not breed...