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

(N/A) $(i)$ Tapeworms are endoparasites that live in the intestine of the host. They absorb pre-digested nutrients directly through their body surface,hence they do not require a digestive tract.
$(ii)$ Frogs exhibit cutaneous respiration through their moist skin while in water and pulmonary respiration through lungs while on land,allowing them to survive in both aquatic and terrestrial environments.
$(iii)$ $A$ whale is classified as a mammal because it is warm-blooded,gives birth to live young,possesses mammary glands to feed its offspring,and breathes air using lungs.