Question

thylacosmilus is a marsupial, and smilodon is a mammal. thylacosmilus and smilodon both have saber teeth, but they do not share an ancestor that had saber teeth. what are saber teeth for these organisms?
analogous structures
homologous structures
vestigial structures
mutated structures

Explanation:

Analogous structures have similar functions but do not share a common - ancestor with the same structure. Since Thylacosmilus and Smilodon do not share an ancestor with saber teeth but both have them, saber teeth are analogous structures. Homologous structures come from a common ancestor, vestigial structures are remnants with reduced function, and there is no indication of mutation as the main factor here.

Answer:

A. analogous structures