Which of these findings highlights the importance of nurture to development?
a. The nervous system matures in a down-and-out fashion-from the head down and from the center out.
b. Rats raised in enriched environments develop more complex and better functioning brain tissue than rats raised in barren environments.
c. Hopi babies, who are traditionally bound to cradle boards for much of their first year of life, show no delays in walking.
d. A human newborn's brain is about 25% of the size of an adult's, but a newborn chimpanzee's is about 60%.
Answer: B. Rats raised in enriched environments develop more complex and better functioning brain tissue than rats raised in barren environments.