Final answer:
The prominent front teeth used by wombats and groundhogs for excavating are analogous structures as they evolved independently despite having similar functions.
Step-by-step explanation:
The prominent front teeth of both Australian wombats and groundhogs for digging are an example of analogous structures. These are features that are similar in function due to convergent evolution but are not derived from a common ancestor. Despite the functionally similar trait, the marsupial wombat and the placental groundhog evolved their prominent front teeth independently.
Mammals generally have heterodont teeth, which include incisors, canines, premolars, and molars, each specialized for different aspects of feeding. They also exhibit diphyodonty, having a set of baby teeth that are later replaced by permanent teeth.