What is suggested by the hypothesis of punctuated equilibrium?
A) There's been no change in life on Earth.
B) There's been gradual and steady change in life on Earth.
C) There have been short periods of dramatic evolutionary change separated by long periods of no change.
D) Life on Earth changes dramatically most of the time, but there are short periods when there's no change.
C
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The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called __________
A. phospholipids B. fats C. proteins D. carbohydrates
How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes? What will be an ideal response?
Which infectious agent produces explosive diarrhea and foul-smelling belches?
a. rotavirus b. Giardia intestinalis c. H. pylori d. intestinal candida e. influenza
What is the approximate pH of ammonia?
a. 2 b. 4 c. 7 d. 8 e. 11