Which of the following is evidence that prolonged childhood evolved for learning and development?
a) Mer children begin spearfishing as toddlers, but don't reach the same efficiency as the most practiced adult until age 10-14
b) All of these
c) Waorani boys can consistently hit leaf and fruit targets with a blowgun at age 5, but don't become proficient until their late teens
d) Language acquisition takes nearly a decade