Carbon dioxide gas
Animals and plants need oxygen. When an animal breathes, it takes in oxygen gas and releases carbon dioxide gas into the atmosphere. This carbon dioxide is a waste product produced by the animal's cells during cellular respiration. Cellular respiration occurs in the individual cells.
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Autopsy’s allow people to know the cause of death of the person. They can tell you if the person was intoxicated, injured, how they were killed, also it can be a huge evidence source to solve other cases that have similar causes of deaths. Hope it helps :)
Vertebrates have a back bone. They have living endoskeleton, pharnyx and efficient respiration, advanced nervous system, and paried limbs.