The answer is B because It helps plants absorb energy and get their nutrients from the sunlight
I believe the answer your looking for is they hang upside down all the time this is one of their survival skills! Hope this helps!
The integumentary system is the skin. Skin protects the inner organs from Bactria. Essentially the skin is a wall protecting against the outside world. It doesn't really release anything but is just there for protection.
Hope this helped!