What was one of Pericles’s achievements? A. the creation of Athenian democracy
B. the building of the Parthenon
C. the protection of Athens from an invasion
D. the defeat of the Spartan army in battle

answer; i believe the correct answer is (crops);

answer; beware of exaggerated claims without supporting evidence;

answer; promote the individual as a "progressive being";

i believe the answer is: true

our brain need to reach a certain level of development   before it could interpret and understood sound with high difficulties. to proof this, we just need to pay attention in musical preference between children and adults. it is far less likely that children would enjoy things such as orchestra or rock band as much as adults due to the difference in this ability.