Final answer:
The combining form 'nat' found in terms innate, antenatal, and native is derived from Latin, meaning 'born' or 'birth', and is related to conditions or traits linked to birth.
Step-by-step explanation:
The combining form shared by the terms innate, antenatal, and native is 'nat', which is derived from the Latin 'natus', meaning born or birth. This root reflects characteristics or conditions that are related to birth.
For example, innate refers to traits or abilities that one is born with, such as temperament or innate traits that influence how one thinks, behaves, and reacts with the environment. Antenatal pertains to the period before birth during pregnancy, and native describes someone or something that is born in a certain place or situation.