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

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Chordata.
(Animals with spinal nervous cord)
Animals cant come under plants, can they?
And as well animals cant be under a non chordata because animals have spinal cords.

Answer:

The correct answer is chordata.

Explanation:

The Reptilia, Amphibia, Mammalia, and the Aves all come under the kingdom Animalia, and all are the part of the basal clade Chordata. This signifies that all these species during a certain point of their life exhibited a notochord. A notochord refers to a cartilaginous rod of skeleton that supports the body in all the embryonic and in some of the adult chordate animals.

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