Which of the following statements is not true of protists?
A. Moisture is absolutely essential to their existence.
B. They make up a substantial fraction of the marine plankton.
C. They are not known to cause diseases of humans.
D. Most are free living.
Answer: C
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Why do we seldom see more than three consumer levels in natural systems?
1.There is not enough energy to support additional levels. 2.Animals haven’t evolved to feed on animals at the third level. 3.Humans take over the role of the fourth-level consumer. 4.There isn’t enough habitat for a fourth level.
If water were nonpolar it would not form hydrogen bonds. At normal room temperatures this nonpolar water would be ________.
A. a liquid B. a solid C. a gas
Predation is considered to be a density-________ factor that controls the size of the prey population
Fill in the blank(s) with correct word
If a person were unable to produce much of this substance, the gastric juices might destroy the stomach lining
A) pepsin B) chyme C) HCl D) mucus