Question

biological species consist of groups of _______.
genera
domains
families
populations

Explanation:

• Genera: A genus (plural - genera) is a taxonomic rank above species. Multiple species make up a genus, not the other way around. So biological species cannot consist of groups of genera.
• Domains: Domains (like Bacteria, Archaea, Eukarya) are the highest taxonomic ranks. Species are much lower in the taxonomic hierarchy. So biological species do not consist of groups of domains.
• Families: A family is a taxonomic rank above genus and species. Multiple genera (which have species) make up a family. So biological species are not made up of families.
• Populations: A biological species is defined as a group of populations whose members have the potential to inter - breed in nature and produce viable, fertile offspring. So biological species consist of groups of populations.

Answer:

populations