Which one of the following explains what xylem loading is?
A. when the xylem is filled with sugars
B. right after the xylem is filled with minerals
C. when the xylem is filled with water
D. xylem loading never occurs
E. phloem has given up its water to the xylem
C. when the xylem is filled with water
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The first reefs on earth were built by:
A. bacteria. B. calcified sponges. C. proteinaceous sponges. D. algae. E. corals.
Embryonic cells that have the potential to become any cell type are called:
a. connective cells b. epithelial cells c. muscle cells d. nerve cells e. stem cells
Prokaryotic cells are likely to be found
a. in and on our bodies, in our food and water. b. in glacial ice that never thaws. c. in acidic springs. d. in hydrothermal vents. e. in all of these
Correctly rephrase the following famous quote from J. B. S. Haldane. "I would lay down my life in order to save two brothers or ________."
A. two grandsons or granddaughters B. one son or daughter C. three uncles D. four cousins E. two nephews and one son or daughter