When one animal looks like another animal to protect itself, this adaptation is called

I believe that would be camouflage.

Explanation:

Camouflage is a defense mechanisms.

this is called mimicry. mimicry is the imitation or looking like something else like in this case. this is also because mimicry is the act of copying the sounds or behaviour of another person or animal.

i think it's c

littering streams           is the answer