Microorganisms do not have to make any special effort to hide themselves (at least not from human beings, if they may do some hiding from certain other microelements of humans).
Likewise, if you propose a theory of aliens which does not involve hiding from humans, e.g. there are aliens, but too distant to be visible to us, that theory will be reasonable. The hiding theory is not.
Microorganisms do not have to make any special effort to hide themselves (at least not from human beings, if they may do some hiding from certain other microelements of humans).
Likewise, if you propose a theory of aliens which does not involve hiding from humans, e.g. there are aliens, but too distant to be visible to us, that theory will be reasonable. The hiding theory is not.