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  • Cnidarians
    . Cnidarians, also known as coelenterates, diverse group of aquatic, invertebrate animals armed with microscopic stinging structures. Cnidar...
  • The Animal Kingdom
    . Kingdom Animalia includes more than one million living species, grouped into more than 30 phyla. Vertebrates, members of the phylum Chord...
  • Land Habitats
    On land, animal habitats are strongly influenced by climate, the combination of precipitation and temperature conditions experienced in a r...
  • Aquatic Habitats
    Animal life first arose in water. Millions of years later, marine and freshwater habitats continue to support a large proportion of the anim...
  • Respiratory Systems in Other Animals
    . The need to take in oxygen and expel carbon dioxide is almost universal among organisms. The movement of these gases between an organism a...