Who is ‘lucy’?
a. the archaeologist who discovered the earliest known primate
b. the earliest known human ancestor
c. the tallest known human ancestor
d. the first goddess of mesopotamia

the three roles stated in the dialogue develop the siblings' personalities.

lloyd's personality looks like a trademarketer

dana's personality is afraid from lloyd's behavior and the oldest sister is a decided person who tries to solve any conflict

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.