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A animal has to have oxygen to live, some animals have evolved to not having oxygen,https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjxv4f49ePL...a web site telling about the animals that have evolved.
Carbon enters the atmosphere as carbon dioxide from respiration and combustion. Carbon dioxide is absorbed by producers to make carbohydrates in photosynthesis. Animals feed on the plant passing the carbon compounds along the food chain. ... The animals and plants eventually die.
Answer:
True, True
Explanation:
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The answer is
<span>B) the endocrine system. </span>
