Sperm are produced in the ____ tubules of the testes
Fill in the blank with the appropriate word.
seminiferous
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Coal contains substantial amounts of mercury. When coal is burned to generate heat or electricity, the mercury is released into the atmosphere. Most of this mercury is eventually deposited in the ocean or other aquatic environments
What happens to the mercury once it is deposited in the ocean? What will be an ideal response?
What structure protects the heart and lungs?
a. vertebral column b. pelvic girdle c. pectoral girdle d. ribs and sternum e. all of these
Which characteristic seems to be most
uniquely correlated with metastasis? a. loss of nuclear-cytoplasmic controls governing cell growth and division b. changes in adhesion proteins on membrane surfaces c. shrinkage of the cytoskeleton d. increase in blood supply to the tumor e. none of these
The pons and medulla oblongata are part of the ____
a. thalamus b. hypothalamus c. cerebrum d. brain stem e. cerebellum