Which scenario is an example of a functional adaptation?

Hello. This question is incomplete. The complete question is:

"Which scenario is an example of functional adaptation?  A. a male bird let's out a mating call to attract a female bird  B. poison dart frogs produce a roxic venmon that they can secrete out thier skin  C. cobras elongate thier body when threatened  D. the color and shape of a flounder allow it to camouflage."

D. the color and shape of a flounder allow it to camouflage.

Explanation:

Functional adaptation is a term used when a living organism adapts its body to the environment so that it helps it to survive. This adaptation may be related to the camouflage of individuals (camouflage helps them survive predator attacks) or the adaptation that allows the glass to generate substances essential to the organism's survival, such as plants that have adapted the way they make photosynthesis.

Among the options given in the question above, one that shows an example of functional adaptation is the letter D.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.