Consider the following scenario

And a muddy lake environment sunfish have brown scales. Most fish, however have silver scales predators have a harder time seeing the fish with brown scales which term best describes the brown scales.

The term that best describes the brown scales in this scenario is "camouflage." The brown scales of the sunfish help them blend in with the muddy lake environment, making it harder for predators to spot them. This camouflage adaptation increases the sunfish's chances of survival.