Biology, 03.04.2020 02:41 barbareishon11
Which of the following do the excretory, digestive, and respiratory system have in common?
A) they are present only in animals with backbones
B) they contain specialized surfaces for exchange with the environment
C) they work independently, without any control by the nervous system
D) they enable the animal to absorb needed materials from its environment
E) they are isolated from the animals internal environment
Answers: 2
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