Which of the following factors is NOT a density-dependent regulator of population size?
a. competition for food
b. limitation of nesting sites
c. disease
d. parasitism
e. drought
E
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The disease osteoporosis involves loss of both mineral and organic components from bones. Which of the following can contribute to the development of osteoporosis?
A. prolonged disuse of muscles B. decline in estrogen following menopause in women C. lack of calcium in the diet D. lack of vitamin D in the diet E. All of the choices for this question are correct
Membranes
What will be an ideal response?
A skeletal system would include all of the following except:a
myofilaments. b. a shell. c. a fluid-filled compartment. d. a system of bones. e. an exoskeleton.
In the human digestive system, the stomach produces about 2 liters of HCl and other gastric secretions every day. Acid secretion by the stomach
A. is stimulated by gastrin. B. begins the process of starch digestion. C. inhibits peristalsis. D. promotes a high pH. E. inhibits pepsin activity.