Amniotes

I am studying Amniota and I was
wondering if someone could explain to me the following concepts. I know that
the features of Chordata are the notochord, dorsal nerve cords, gill clefts
(except for Tunicata); segmented muscles and a post-anal tail. I know that
developmentally we are related to echinoderms. Can you explain the relationship
between the Cordata and Echinodermata? Using the bird, reptile and mammal (or
those that came from an aminotic egg) as an example can you explain the
following:

a) Why these 3 (bird, reptile and
mammal) are grouped together?

b) What advantages (from an
evolution perspective) do these three (as representatives of chordata) have
over echinoderms?

c) How the above advantages suit a
certain environment or habitat?

Also can you some websites that
might be helpful in understanding this concept.

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