Question

what do we call these structures? ( look back at your notes )
heterozygous bones
homologous structures
vestigial organs
fossil record

Explanation:

Homologous structures are similar in structure but may have different functions, resulting from common ancestry. Heterozygous refers to genetics of alleles, not bone - related structures. Vestigial organs are remnants with reduced or no function. Fossil record is about preserved remains, not a name for structures in general as asked.

Answer:

B. Homologous structures