Radioactive radon gas is emitted from
a. rocks and soil.
b. medical x-rays.
c. cosmic radiation.
d. nuclear medicine.
e. uranium mines.
A
Biology & Microbiology
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Which of the following are wave-resistant formations that consist primarily of calcium carbonate secreted by generations of coral polyps?
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A chromosome that has a centrally-placed centromere is called ____________________
Fill in the blank(s) with correct word
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Membrane delimited intracellular structures that perform specific functions in cells are called
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