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- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Map%3A_Raven_Biology_12th_Edition/25%3A_The_Origin_and_Diversity_of_Life/25.05%3A_Ever-Changing_Life_on_Earth/25.5.02%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of roughly 95 percent of the extant species at that time.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_2e_(OpenStax)/05%3A_Unit_V-_Biological_Diversity/5.07%3A_Introduction_to_Animal_Diversity/5.7.05%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of an estimated 95 percent of the extant species at that time.
- https://bio.libretexts.org/Workbench/General_Biology_I_and_II/05%3A_Unit_V-_Biological_Diversity/5.06%3A_Introduction_to_Animal_Diversity/5.6.02%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of roughly 95 percent of the extant species at that time.
- https://bio.libretexts.org/Courses/Norco_College/OpenStax_Biology_2e_for_Norco_College/27%3A_Introduction_to_Animal_Diversity/27.05%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of an estimated 95 percent of the extant species at that time.
- https://bio.libretexts.org/Workbench/BIOL-11B_Clovis_Community_College/09%3A_Porifera_and_Cnidaria/9.01%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of an estimated 95 percent of the extant species at that time.
- https://bio.libretexts.org/Courses/Thompson_Rivers_University/Principles_of_Biology_II_OL_ed/03%3A_Systematics_Phylogeny_and_Biological_Diversity/3.04%3A_Biological_Diversity/3.4.05%3A_Kingdom_Animalia_-_Evolution_and_PhylogenyAnimal evolution began in the ocean over 600 million years ago with tiny creatures that probably do not resemble any living organism today. Since then, animals have evolved into a diverse kingdom know...Animal evolution began in the ocean over 600 million years ago with tiny creatures that probably do not resemble any living organism today. Since then, animals have evolved into a diverse kingdom known as Animalia or Metazoa. Although over one million extant species of animals have been identified, scientists are continually discovering more species as they explore ecosystems around the world.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_1e_(OpenStax)/5%3A_Biological_Diversity/27%3A_Introduction_to_Animal_Diversity/27.4%3A_The_Evolutionary_History_of_the_Animal_KingdomThe morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphol...The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth’s history, a loss of roughly 95 percent of the extant species at that time.
