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  • Taxonomy (1)
    • Vertebrates Vertebrates
      • Fishes Fishes
      • Amphibians Amphibians
      • Reptiles Reptiles
      • Birds Birds
      • Mammals Mammals
    • Invertebrates Invertebrates
      • Cnidarians Cnidarians
      • Echinoderms Echinoderms
      • Arthropods Arthropods
      • Molluscs Molluscs
    • Plants Plants
      • Ferns Ferns
      • Gymnosperms Gymnosperms
      • Angiosperms Angiosperms
    • Protists Protists
      • Foraminifera Foraminifera
      • Radiolarians Radiolarians
      • Dinoflagellates Dinoflagellates
  • Geologic Age
    • Extant Extant
    • Cenozoic (indet.) Cenozoic
      • Holocene Holocene
      • Pleistocene Pleistocene
      • Pliocene Pliocene
      • Miocene Miocene
      • Oligocene Oligocene
      • Eocene Eocene
      • Paleocene Paleocene
    • Mesozoic (indet.) Mesozoic
      • Cretaceous Cretaceous
      • Jurassic Jurassic
      • Triassic Triassic
    • Paleozoic (indet.) Paleozoic
      • Permian Permian
      • Carboniferous Carboniferous
      • Devonian Devonian
      • Silurian Silurian
      • Ordovician Ordovician
      • Cambrian Cambrian
    • Precambrian Precambrian
  • Elements
    • Skeleton Skeleton
      • Cranium Cranium
      • Mandible Mandible
      • Teeth Teeth
      • Postcranium Postcranium
      • Soft Tissue Soft Tissue
    • Stem Stem
    • Seed Seed
    • Leaf Leaf
    • Flower Flower
    • Root Root
    • Wood Wood
  • Ontogenetic age
    • Adult Adult
    • Subadult Subadult
    • Juvenile Juvenile
    • Infant Infant
    • Larva Larva
    • Embryo Embryo
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  • Xenopus laevis
    Xenopus laevis