Give an example of the following:
$(a)$ $A$ viviparous animal
$(b)$ $A$ fish possessing a poison sting
$(c)$ $A$ fish possessing an electric organ
$(d)$ An organ which regulates buoyancy
$(e)$ An animal which exhibits alternation of generation
$(f)$ An oviparous animal with mammary glands

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(N/A) Chimpanzee (or any mammal like Human or Whale).
$(b)$ Stingray (Trygon).
$(c)$ Electric ray (Torpedo).
$(d)$ Air bladder (Swim bladder).
$(e)$ Obelia.
$(f)$ Platypus (Ornithorhynchus).

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