Which is the best description of the function of the respiratory system?

A) facilitates gas exchange between the environment and body cells
B) delivers oxygen to the blood
C) fills the lungs with air
D) delivers carbon dioxide to the blood


Answer: A

Biology & Microbiology

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Which of the following are possible reasons for the high level of angiosperm diversity?

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The tetrapods include:a

fish, amphibians, reptiles, and mammals. b. lancelets, cartilage, and bony fish. c. amphibians and reptiles. d. amphibians, reptiles, birds, and mammals. e. echinoderms and chordates.

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Since a carbon atom has 4 valence electrons, it can complete its valence shell by forming a total of 4 hydrogen bonds

__________________ Indicate whether the statement is true or false.

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Will there soon be a vaccine for the virus causing AIDS? Explain.

What will be an ideal response?

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