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Figure 73.
All living things share a common ancestor with lizards, rabbits, and humans, in which the
amniotic egg evolved. Thus, the clade Amniota includes lizards, rabbits, and humans. A larger clade known
as vertebrata includes fish and lamprey.
Which animals in this figure belong to a clade that includes animals with hair? Which evolved first:
hair or the amniotic egg?
Depending on the referenced branch point, clades can range in size. The crucial aspect is that
every organism in the clade or monophyletic group descended from the same location on the tree.
This is easy to remember because monophyletic is made up of the words "mono," which means one,
and "phyletic," which means evolutionary relationship.
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