The stem cells from which sperm cells descend are called
A) spermatogonia.
B) secondary spermatocytes.
C) spermatids.
D) patagonia.
A) spermatogonia.
Biology & Microbiology
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Vasectomy causes sterility because
a. sperm is no longer be produced. b. sperm no longer leave the testis. c. sperm no longer reach the vas deferens. d. sperm no longer reach the urethra. e. semen is no longer produced.
Biology & Microbiology
A wind system that influences large climatic regions and reverses direction seasonally, producing dry and wet seasons, is referred to as a(n):
a. geothermal ecosystem b. upwelling c. taiga d. monsoon e. hurricane
Biology & Microbiology
What part of our skeleton most resembles an exoskeleton?
What will be an ideal response?
Biology & Microbiology
A declining population is indicated by
a. A. b. B. c. C. d. D. e. none of these
Biology & Microbiology