Which among these is the correct combination of aquatic animals?
A. Trygon, whales, seals
B. Seals, dolphin, sharks
C. Dolphins, seals, trygon
D. Whales, dolphins, seals

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Detailed Solution

Trygon: Belongs to the class Chondrichthyes under superclass Pisces. It has a poisonous sting. Members of this class are poikilothermic (cold-blooded), viviparous, and reproduce through internal fertilization. Sharks are also part of this class.
Whales: Aquatic mammals belonging to the class Mammalia. They breathe air through blowholes, are warm-blooded, and have limbs modified into flippers.
Sharks: Aquatic animals of class Chondrichthyes. Their skeleton is made of cartilage, and their teeth are modified placoid scales. Most sharks are heavy and must keep swimming to avoid sinking.
Dolphins: Aquatic mammals that breathe through lungs and surface regularly for air. Their limbs are adapted into flippers.
Seals: Another group of aquatic mammals, adapted for swimming and living in cold marine environments.

Correct Answer: Option (D)

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