The first organ to develop in the embryo is the heart. In a fetus, there is a brain, but it isn't fully developed and can't understand signals from the nervous system. Therefore the first functional organ would be the heart. But the first thing to start developing in a fetus is the nervous system. ( no that isn't an organ )
DNA and RNA are made up of nucleic acids.
An Arrhenius acid donates H+ ions. (apex).
It is the part of the atom with the greatest mass.
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steak and potatoes