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OpenStudy (anonymous):

While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?

OpenStudy (baby456):

Chordata. Chordata aren't animals with skulls, they are animals with a spinal nervous cord. The most famous sub-group of them is the vertebrata, which includes amphibians, reptiles, birds and mammals.

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