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BIOLOGY

JAMB 2015 - Question 1

Biology 2015 JAMB Past Questions - Question 1: Which of the following has the most primitive respiratory system?

Choose the most appropriate option for the gap .

Which of the following has the most primitive respiratory system?

A: Insect

B: Fish

C: Snail

D: Mouse

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Correct Answer

Explanation

The evolutionary trend of animals shows that snail (Mollusca) is the least developed, while mouse (mammal) is the most developed. The trend is in this order Snail—>insect —> Fish —> Mouse. The respiratory organ of snail is, that of fish is fish, insect is. trachea and mouse is lungs.