Species are subdivided into smaller groups called subspecies. For people, the human species is subdivided into smaller groups called

a. ethnic groups

b. species

c. breeding populations

d. races

e. all of the above

a. ethnic groups

Explanation:

In population genetics, ethical groups are the subdivision of the human species and are groups of people who identify with each other, or are identified as such by third parties, based on cultural or biological similarities, or both real or presumed.

It is important to consider the genetics of ethnic groups if we are to distinguish them from a group of individuals who share only cultural characteristics. These genetic characteristics were developed during the process of adapting that group of people to a given geographic space or ecosystem (encompassing climate, altitude, flora and fauna) over several generations.

Ethnicities often refer to founding myths that reveal a more or less remote notion of kinship among their members. Current genetics tends to verify the existence of this genetic relationship, but the evidence is subject to discussion.