The nictitating membrane's function is to provide the eye with a special extra level of safety while the creature is still able to see.
Answer:
long tail for increased chance against predators - structural
vibrant tails to discourage predation - structural
external gills on head to filter out water - structural
certain types have upturned mouths to help eat from the surface of the water (e.g. tadpoles of Asian Horned Frog) - structural
the Honduran tadpole has a behavioral adaptation wherein it turns it's body upside down to reach the surface
Explanation:
Answer:
Each villus, in turn, has thousands of even smaller projections called microvilli (singular: microvillus).
Explanation:
The villi contain capillaries, which are tiny blood vessels. Nutrients are absorbed into these capillaries across the surfaces of the villi and microvilli. Because there are millions of these tiny projections, they greatly increase the surface area for absorption.