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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/Courses/Thompson_Rivers_University/Principles_of_Biology_II_OL_ed/03%3A_Systematics_Phylogeny_and_Biological_Diversity/3.03%3A_History_of_Life_on_Earth/3.3.03%3A_Evidence_for_Early_LifeProkaryotic organisms were the first living things on earth and still inhabit every environment, no matter how extreme. Prokaryotes are well adapted to living in all types of conditions, including ext...Prokaryotic organisms were the first living things on earth and still inhabit every environment, no matter how extreme. Prokaryotes are well adapted to living in all types of conditions, including extreme ones, and some prefer to live in colonies called biofilms. Archaea are believed to have evolved from gram-positive bacteria and can occupy more extreme environments.
- https://bio.libretexts.org/Workbench/General_Biology_I_and_II/05%3A_Unit_V-_Biological_Diversity/5.1%3A_The_Origin_and_Diversity_of_Life/5.1.3%3A_Evidence_for_Early_LifeProkaryotic organisms were the first living things on earth and still inhabit every environment, no matter how extreme. Prokaryotes are well adapted to living in all types of conditions, including ext...Prokaryotic organisms were the first living things on earth and still inhabit every environment, no matter how extreme. Prokaryotes are well adapted to living in all types of conditions, including extreme ones, and some prefer to live in colonies called biofilms. Archaea are believed to have evolved from gram-positive bacteria and can occupy more extreme environments.
- 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.
