What is your working definition of race? Of ethnicity? Are these two terms interchangeable or do…

Each DQ must be at least 150 words each in Turbian Format
DQ1What is your working definition of race? Of ethnicity? Are these two terms interchangeable or do they signify entirely different but related concepts?
DQ 2
How was Social Darwinism used to classify some “races” as inferior and justify actions against them? Did these philosophies distinguish between “race” and “ethnicity?”