Phylum Chordata

These are animals which at some stage in their life-cycle having had a notochord or spinal column, gill-slits, and post-anal tail. It includes humans and other vertebrates.  There are 14 classes, often in three subphyla: Subphylum Cephalochordata1 — Lancelets Class Leptocardii — Lancelets Subphylum Tunicata1 — Tunicates Class Appendicularia — Pelagic Tunicates Class Ascidiacea — Sea … Continue reading "Phylum Chordata"

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Class Aves

Birds are characterised by feathers, toothless beaked jaws and a strong lightweight skeleton who lay eggs with hard shells. Most can fly but some, like the ostrich, kiwis, rheas, and cassowaries, have lost that ability. Most of these birds have long legs adapted for running. Penguins are also flightless but their body shape has adapted … Continue reading "Class Aves"

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