The bubbles in beer are ____

a. carbon dioxide
b. oxygen
c. ethanol
d. pyruvate
e. nitrous oxide


ANSWER: a

Biology & Microbiology

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Looking at the figure above, use phylogenetic reasoning to explain whether feathers evolved for flight and why. What other possible advantages could feathers provide? Is there a way we could distinguish among oth-er alternatives to flight?

Explain your answer. What will be an ideal response?

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