What term describes the study and evaluation of human conduct based on moral principles?
a. ethics
b. hippocratic oath
c. non-malfeasance
d. nuremberg code

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

answer; /// the correct answer is (a) burned the city;