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Because of counter-current exchange, fish gills are the most efficient at gas exchange. This is followed by the continuous flow of bird lungs (due to their system of air-sacs). I don't know which animal exactly, but look to the fish for your answer.

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Q: The Group of animals with the most efficient respiratory system?
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What groups of animals have the most efficient gas exchange?

I would argue that the Albatross is one of the most efficient animals. It does not have to flap it's wings when it soars across the oceans since it's wing bones lock into place. It is also able to sleep while flying. It has a glide efficiency of 20 feet forward for every 1 foot down.


Why is respiratory system called a 'system'?

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A group of organs and tissues that exchange oxygen and carbon dioxide between your body and the environment?

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group of cells = tissue group of tissues = organ group of organs= organ system eh respiratory system, skeletal system, muscle system


What is oragniZation?

An Organ system can be defined as in Biology, a Biological system(or organ system) is a group or organs that work together to perform a certain task. Common systems such as those present in mammals and other animals, seen in human anatomy, are those such as the circulatory system, the respiratory system, and the nervous system.


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The group of organs that take in oxygen from the air is called the?

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