Final answer:
The two major clades of Amniota are synapsids and sauropsids, with humans and rabbits being part of the synapsid clade that includes animals with hair. The amniotic egg evolved before hair, allowing terrestrial reproduction.
Step-by-step explanation:
The two major clades of Amniota are the synapsids and the sauropsids. Among the animals listed, rabbits and humans belong to the clade that includes animals with hair, which is the synapsid clade. We belong to this clade as we are humans, and humans are categorized as mammals within the synapsids. The amniotic egg evolved before the development of hair. This adaptation was crucial for life on land as it allowed the embryo to develop in a protected environment away from water. In the context of phylogenetic history, mammals including humans, evolved from the synapsid branch of amniotes, which eventually gave rise to animals with hair.