Evolution: Fish, Schools, and Photography

7/01/2009 01:34:00 PM ·

There is quite a dispute on the fossils records of prehistoric fish evolving into land vertebrates. Some say the fish that had hinged jaws at the time had a better chance of survival possibly because this particular anatomical structure, much like me have, has more force and allows for greater respiration.

The first jaws ever found were in Placodermi fossils. The fish were said to evolve from the Sea squirt, a coral like creature, whose larvae resemble primitive fish in some key ways.

The first ancestors of fish may have kept the larval form into adulthood (as some sea squirts do today), although perhaps the reverse of this is the case. Candidates for early fish include Agnatha such as Haikouichthys, Myllokunmingia and Conodonts.

Schools of Fish

Over time these creatures have evolved and assembled their own type of interactive social network or school. These schools of fish tend to synchronize their swimming so that all fish move at the same speed and in the same direction. The advantages of this social network is that it provides a barrier or rather increased protection from predators.

by World Resources Institute Staff

Also check out Hooked on National Geographic


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