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Which of the following do the excretory, digestive, and respiratory systems have in common?
a. They work independently, without any control by the nervous system. b. They are present only in vertebrate animals. c. They contain specialized surfaces for exchange with the environment. d. They enable the animal to absorb needed materials from its environment.​

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Answer:

a.  Animals are complex multicellular organisms that require a mechanism for transporting

b. supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste compounds.

c. irculatory system. In humans, other mammals, and birds, blood absorbs oxygen and releases carbon

d. charge is  carbon dioxide, work in tandem.

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