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Answer to Question #105252 in Zoology for Titomi
Question #105252
Which of the following has the most primitive respiratory system?
(a) insect (b) fish (c) snail (d) mouse
(a) insect (b) fish (c) snail (d) mouse
Expert's answer
The right answer is A) Snail
Explanation: this organism is the oldest among all the options (Cambrian period of Paleozoic Era). Also, it has developed a simple lung from the mantle cavity.
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