<span>Countercurrent oxygen exchange I think
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The oldest type of bacteria is over 3 million years old I think. It comes from the cyanobacteria family! The bacteria is a type of algae! Discovered by Gregorio V. in the Late 1900's.
<span>Normal urine is usually pale yellow to amber in color, due to the presence of Urochrome!</span>
A cool looking app gggggg