What was the second great discovery in genetics mentioned in the video? Who made it? What was the time period? What organism was used to make the discovery?

Why may some young adults go through a quarter-life crisis? a. they are entering middle age and feel distressed about growing old. b. they feel insecure about themselves and their future. c. they have been promoted to more secure, better-paying jobs. d. they have developed more stable personal relationships.