No refuge could save the hireling and slave. From the terror of flight or the gloom of the grave: And the star-spangled banner in triumph doth wave. O'er the land of the free and the home of the brave. O thus be it ever when free-men shall stand. Between their lov'd home and the war's desolation; Blest with vict'ry and peace, may the heav'n-rescued land.
Chordates are animals with backbones. Animal groups in the chordate phylum include fish, amphibians, reptiles, birds and mammals. Animals with backbones are the most highly evolved groups of animals, the most complex and complicated. They have interior skeletons and have bilateral symmetry. They have more advanced brains.
Endoskeleton is found in the sub-class Coleoidae. The animals that come under Phylum Chordata are all vertebrates including human beings. Phylum Porifera are sponge like animals and has almost 5000 species. Its skeleton is a compound of organic fibres, a base of calcite and aragonite and spicules of silica.