by Doly » Tue 13 Jun 2006, 09:51:03
$this->bbcode_second_pass_quote('rsch20', '
')but if water has zero chemical energy, why do we drink it? animals use water, oxygen, and food as primary fuel sources, and plants use water,nitrogen/pottassium etc from soil, sunlight, and carbon dioxide as primary fuel sources right?
I'm not saying you are wrong, I'm just having trouble processing this concept when all biological machines use water and it is considered the 'keystone of life'.
The main reason living beings are mostly water is because life appeared in the oceans. Living beings are watery for the same reason that if you live in the woods, you are likely to make your home of wood, but if you live in the plains and there's lots of clay, you'd make your home of bricks.
Water, besides from being plentiful, is good at dissolving things. Life needs a lot of chemical reactions, and they happen a lot better when the compounds are dissolved in something. Water was there and does the job nicely.
Besides, water is liquid at normal Earth temperatures, and liquids are generally good for transporting things. For example, to transport nutrients across the whole organism.