The Most Primitive Respiratory System

chikis

Quote by tal444

Not only that, but gills and lungs are far more evolved and developed than the simple spiracles of insects. Gills are specially adapted to life in liquids. That doesn't automatically mean that it is more primitive. If we are discussing primitive as the most "simple" or least developed, than gills are certainly not the answer.

Then bring a good point to back your conviction.

tal444

... 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

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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tal444	... 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	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.