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Q: Which of the following organism has a 2-chambered heart?
  • A. Human beings
  • B. Sparrows
  • C. Monkey
  • D. Fishes
Correct Answer: Option D - Fishes belong to class Pisces, which have two chambered heart, while amphibians and reptiles have three chambered heart and birds have four chambered heart. Human beings has four chambered heart.
D. Fishes belong to class Pisces, which have two chambered heart, while amphibians and reptiles have three chambered heart and birds have four chambered heart. Human beings has four chambered heart.

Explanations:

Fishes belong to class Pisces, which have two chambered heart, while amphibians and reptiles have three chambered heart and birds have four chambered heart. Human beings has four chambered heart.