Why is it necessary for the testes to be in the scrotum to function properly?
A) The scrotum keeps the testes at a cool temperature necessary for sperm production.
B) The sperm are produced in the scrotal tissue and transferred to the testes to finish maturation.
C) The scrotum contains alkaline fluids to nourish the sperm.
D) The testes develop from scrotal tissues.
E) The scrotum elevates the temperature of the testes, which increases sperm production.
A
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Which of the following statements is true?
a. Organs receive either parasympathetic fibers or sympathetic fibers but not both. b. The sympathetic nervous system that supplies an organ will also provide parasympathetic fibers to it. c. Both the sympathetic and parasympathetic have either excitatory or inhibitory effects. d. The sympathetic branch of the sympathetic system usually speeds up the activities of the body. e. All of these are true.
Which type of soil is best able to retain calcium and potassium, preventing them from being leached away by runoff?
A. humus B. clay C. sand D. All soils are equal in preventing leaching of minerals. E. None of these soils would prevent leaching of minerals.
__________________ isolating mechanisms include hybrid mortality and hybrid infertility.
a) Postzygotic b) Sympatric c) Prezygotic d) Barrier e) Environmental
Which of the following genotypes represents a human male?
a. XY c. XX b. YY d. XO