> Moon, you're not the only one derailed!
Not me! I didn't ask the question, I just said that all fish are chordates
supposedly derived from a small chordate from the Cambrian period called a pika.
Since at the time of the pika (pika were rare) arthropods were varied and
numerous it seems likely that arthropods would be more common than chordates on
other planets since the arthropod body plan evolved early and with many
variations. If pika hadn't squeaked by there would be no chordates at all and
arthropods (or maybe cephalopods) would rule the earth! Lets hear it for the land
squid described in a recent science channel show about future animals!
Moon
Moon
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