Multiple choice

Which of the following animals possess double circulation?

a. Fishes b. Birds c. Mammals d. Amphibians

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only a and d

  5. Only b and d

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as birds and mammals possess double circulation.