With a lineage dating back before the time of the dinosaurs, fish are one of the Earths oldest and most enduring life forms. Scientists estimate that there are over 28,000 different species of fish on the planet, with huge variations in size and appearance among them. However, all fish from the largest wild species that trolls the depths of the ocean to the tiniest goldfish happily swimming around its bowl share many things in common, many of which you may not know about.
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