THE AMNIOTES GROUP:

This group is defined by the way it reproduces. AMNIOTIC FLUID, which is suppose to simulate the embryos own pond is only found in this group. Amniotes originated from the Amphibian group, who lade there embryos in the water. Embryos need a fluid, nutrient rich medium.

This diagram shows the embryo (top) within aquatic medium. (bottom left) Shows the egg with a shell and amniotic fluid is the surounding medium. (bottom right) Shows how All embryos develope and how they interacts with their surounding medium.
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