As elevation increases

a. O2 availability increases.
b. O2 availability decreases.
c. O2 availability remains constant.
d. O2 levels increase, but there is none present above 20,000 feet.
e. O2 levels decrease, but there is none present above 20,000 feet.


B

Biology & Microbiology

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__________ are important and common unicellular exocrine glands.

Fill in the blank(s) with correct word

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