Traits that evolved early, such as the hole in the hip socket, are called primitive traits.
Clades Lolliana happened in -16.
Urio Clades has written: 'Roccatagliata Ceccardi'
there are 8 more of taxa true clades here are some Pises, Amphibia, Mammalia and Tetudines
The prevailing theory is called cladistics. This relies on unique homologies, or structures which members of the clade possess to the exclusion of all other clades. For example, all mammals give milk (the females, anyway) and no other animal gives milk, so mammals are a distinct clade, in this case, a "class." Smaller distinctions determine that certain creatures belong in smaller clades, called "orders," "families," "genera" and "species."
You have to stick your finger in your anus
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Different diversification rates for two clades of animals.
Different diversification rates for two clades of animals
Different diversification rates for two clades of animals.
are used to name and define clades phylogenetically.
Different rates of phylogenetic change for three clades of Darwin's finches.
Bacteria is a clade if you (or anyone else) say it is. However, neither biodiversity nor anything else can be non-contradictory partitioned into clades, so the question does not have any non-contradictory (unambiguous, or objective) answer. Clades are and will always be purely subjective.