Answer:
The encomienda and slavery are similar because they involve the forced labor of people and said forced laborers were treated horrendously and often given little to no care, or pay.
Explanation:
The method that was used and developed only after Darwin's time and is today a widely used method is the method of DNA comparison. At the time of Darwin, people didn't know about DNA or how it was structured, this was changed in the 20th century with the discovery of the double helix.
John McCain went on 23 combat missions, the twenty third being the one where he became a prisoner of war in Vietnam which became a famous thing. When he returned home he remained in the military but as a commander and didn't fly into combat missions.