JAMB Biology 2007 Objective — Question 11

Question 11 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2007 Objective paper, with the correct answer and a full explanation.

Which of the following has the most primitive respiratory system?

A. Fish
B. SnailCorrect
C. Mouse
D. Insect

Explanation

Among invertebrates, mollusks (e.g. snails) evolved before arthropods (e.g. insects), so the snail has the more primitive respiratory system; fish and mouse (vertebrates) have more advanced systems.

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