JAMB Biology 2019 Objective — Question 9

Question 9 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2019 Objective paper, with the correct answer and a full explanation.

Which of the following has a four-chambered heart?

A. fish
B. insect
C. snail
D. ratCorrect

Explanation

Mammals (like the rat) and birds have four-chambered hearts (two auricles, two ventricles). Fish have two-chambered hearts; amphibians have three chambers.

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