A
Sodium nitrate
B
Zinc oxide
C
Calcium oxalate
D
None of these
<div style="text-align: justify;">Most kidney stones are <b>calcium stones, usually in the form of calcium oxalate</b>. Oxalate is a substance made daily by your liver or absorbed from your diet. Certain fruits and vegetables, as well as nuts and chocolate, have high oxalate content.</div>
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A
Anopheles
B
Tubercule bacillli
C
Variola virus
D
Salmonella typhi
Typhoid fever is caused by <em>a type of bacteria called Salmonella typhi</em><span><br></span>
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A
Volcanic eruption
B
Organic matter decay
C
Photosynthesis
D
All of these
<div style="text-align: justify;">Notice that <b>photosynthesis and respiration</b> are essentially the opposite of one another. Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2.</div>
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