Answer:
Homologous structures
Step-by-step explanation:
Homologous structures are basic organ structures that are similar, which are shared among organisms that are of the same ancestral line or origin. These homologous structures may not be similar in function or in appearance in the different organisms of an ancestral origin that share such structures. An example of basic organ structures shared by mammals is the forelimbs, which is present in bats, humans, cats etc.