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Adenine and Thymine pair together
Guanine and Cytosine pair together
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Step 2. Simplify
13
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Your answer is A. 13 Hope this helps!
How many places are there for electrons in the second shell of an atom? The answer is C) 8 electrons
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Answer:
Birds require high levels of oxygen and, therefore, high rates of gas exchange due to flight demands. Avian resting oxygen consumption is high compared to that of mammals and other vertebrates, and this increases even more during the flight.
Explanation:
Compared to mammals, birds have specific adaptations of the respiratory system that result in higher levels of oxygen exchange.