Which of the following has the most primitive respiratory system?
(a) insect (b) fish (c) snail (d) mouse
1
Expert's answer
2020-03-13T10:06:04-0400
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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