List the functions of the urinary system.
What will be an ideal response?
1. excretion of metabolic wastes
2. maintenance of water-salt balance
3. maintenance of acid-base balance
4. secretion of hormones
5. reabsorption of filtered nutrients
6. synthesis of vitamin D
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Which one of the following most accurately describes the ratio of oxygen to carbon to hydrogen in a simple sugar such as glucose?
A. 1 : 2 : 1 B. 1 : 1 : 2 C. 2 : 1 : 1 D. 1 : 2 : 3 E. 1 : 3 : 2
In desertification ________
a. lands are deserted because chemical contamination makes them unsafe for human habitation b. marginal agricultural lands are deserted to permit the re-establishment of native communities c. large regions of land capable of supporting agriculture are degraded to a desert-like condition d. marginal desert-like tracts of land are rehabilitated and put back into agricultural production
Which of the following designates a normal human female?
a. XXY b. XY c. XX d. XYY e. XO
Refer to Figure 51-3. The amnion is identified by number:a
1. b. 2. c. 3. d. 4. e. 5.