Refer to the accompanying figure. Place figures 1-4 in the correct order to represent the two-cycle breathing process of birds
a. 1 ? 2 ? 3 ? 4
b. 2 ? 3 ? 4 ? 1
c. 2 ? 3 ? 1 ? 4
d. 3 ? 2 ? 1 ? 4
e. 4 ? 3 ? 2 ? 1
c
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Scientists have found that extinction rates among ____ are accelerating rapidly
a. endangered species b. trigger species c. bird species d. amphibian species e. plant species
What characteristic distinguished Progymnosperms from conifers?
a. a single megaspore within the antheridium b. the ability to hibernate during droughts c. reproduction via spore dispersal d. a strobilus containing a single megaspore
Which of the following statements is correct?
A) Prokaryotic cells and eukaryotic cells evolved at the same time. B) Prokaryotic cells evolved a lot earlier (over a billion years) than eukaryotic cells. C) Eukaryotic cells evolved a lot earlier (over a billion years) than prokaryotic cells. D) Scientists do not have any evidence on whether prokaryotic or eukaryotic cells evolved first.
Which of the following cube-shaped objects would have the highest surface-area-to-volume ratio? A cell with a volume of
A. 10 cm3. B. 8 cm3. C. 3 cm3. D. 1 cm3.