Key Innovations in Animal EvolutionEarly biologists used morphology to study evolutionary trends in major animal...
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Key Innovations in Animal EvolutionEarly biologists used morphology to study evolutionary trends in major animal groups.Tissue and tissue layers appeared early in animal evolution.Primary cell layers of tissue include the endoderm, ectoderm, and mesoderm.A few diploblastic animals have only two layers.Most animals exhibit either or Sponges are an exception and areCephalization evolved insymmetrical animals.Many animals have body cavities that surround their internal organs.animals do not have a cavitymuscles of the bodysymmetryanimals have a fluid- or organ-filled space between the gut andwallanimals have a fluid-filled body cavity lined by the peritoneumThe fluid can serve as a hydrostatic skeleton and allows movement of the organism aswell as provides support.
Key Innovations in Animal EvolutionEarly biologists used morphology to study evolutionary trends in major animal groups.Tissue and tissue layers appeared early in animal evolution.Primary cell layers of tissue include the endoderm, ectoderm, and mesoderm.A few diploblastic animals have only two layers.Most animals exhibit either or Sponges are an exception and areCephalization evolved insymmetrical animals.Many animals have body cavities that surround their internal organs.animals do not have a cavitymuscles of the bodysymmetryanimals have a fluid- or organ-filled space between the gut andwallanimals have a fluid-filled body cavity lined by the peritoneumThe fluid can serve as a hydrostatic skeleton and allows movement of the organism aswell as provides support.
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