State reasons for the following : (i) Tapeworms do not have digestive tract. (ii) Frogs have both skin and lungs for breathing. (iii) Whale is a mammal not a fish

(i) Parasitic, derive digested food from the host.
(it) Skin to breathe in water, lungs on land.
(iii) Whale is warm-blooded, give birth to young ones, has mammary glands.