How did Charles Darwin explain the colorful tail of the peacock Proposed the idea of sexual selection Ichtyostega was the first tetrapod had four legs and lived on land Charles Darwin Four Postulates The term fitness refers to Ostracoderms were the first vertebrates to appear in the fossil record Ray finned fish is the vertebrate group with the largest number of species Ostracoderms were first found in the fossil record in the Cambrian period From oldest to youngest Ostracoderms Myxini Chondrichthyes Amphibia Characteristics of the Phylum Chordata In the pepper moth film the soot and pollution from factories caused the moths to undergo a color change super position means that in geology the youngest rocks are on the top layer of rock Vertebrates that were on land were first found in the Devonian period Chondrichthyes are a vertebrate group whose skeletal system is composed entirely of cartilage Class Sarcopterygii When did birds aves appear in the fossil record Jurassic Period During the Carboniferous period the first reptiles appeared in the fossil record Ostracoderms became extinct in the Devonian period
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