For instance, the oldest known fossils to be discovered, the Trilobita, were aquatic creatures that existed in the oceans, leading many experts to theorize that the origins of life more than likely came from the ocean.
海洋是生命的根源地球上飽含水分和養分的海洋，不但孕育了三葉蟲（現有最古老的生物化石）；而且很可能是所有生命的源頭。