The Most Primitive Respiratory System

by chikis
Tags: primitive, respiratory
tal444 is offline
Mar27-12, 06:53 PM
P: 157
... I thought I made my point. Gills are adapted to living in water because lungs are useless in water, thus they have evolved. Lungs are specially adapted to life on land, because they have evolved to get the most surface area to obtain oxygen (alveoli). Insects, on the other hand, still only have relatively simple organs that allow diffusion of air in and out.
chikis is offline
Apr26-12, 12:52 AM
P: 235
It is very obvious that grasshopper has the most primitive respiratory system but according to the past question and answer booklet where I got the question from, the answer there is fish and am dragging hard to get a concrete explaination to that.

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