Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing.
B. competition-tolerant species colonize first.
C. climax communities rarely form.
D. succession is determined largely by species that exist in the ground as seeds or old roots.
E. succession is random and cannot be predicted by existing species.
Answer: D
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Indicate whether this statement is true or false.
HCl in the stomach acts to
a. neutralize buffers. b. kill harmful bacteria. c. switch off certain digestive enzymes. d. produce trypsin. e. prevent breakdown of protein.
The process by which species ceases to exist
A. has never occurred. B. is speciation. C. is extinction. D. is occurring today at a faster rate than ever before. E. All answers are correct.
What is the key difference in defining "obese" and defining "overweight"?
A) An obese person always carries weight as excess muscle. B) An obese person always carries weight as excess fat. C) An overweight person always carries weight as excess fat. D) The two terms mean the same thing.