The "eight glasses a day" rule presumes 8-oz glasses:
8 x 8 = 64 oz = 2 quarts
1 quart = 946 ml x 2 = 1892 ml
So you should drink 3.784 of those 500ml bottles of water.
Looked at another way, each of those 8oz glasses of water holds 236.5 ml, so if you drink all four 500ml bottles of water, you're drinking a little more than 8 1/2 glasses of water.
Looked at a third way, if you measure an extra half-ounce of water into each of your eight glasses, you're up to four 500ml bottles.
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The answer is the antibiotics could unintentionally kill good bacteria living in your intestines, leaving you more susceptible to infection by pathogenic bacteria.
Antibiotics will indiscriminately kill any of the bacteria they come into contact with that have similar characteristics to the pathogen being targeted. This can cause trouble because many helpful bacteria live in your large intestine. Antibiotics target bacteria and not viruses. If you take antibiotics it is important to restore any good bacteria in your gut by taking probiotics at the same.
Answer:
Cells are the basic building block of all living things.
