Michelle, who is 18 months old, has a pet dog named Sam. Aer she learns the name of her dog, she calls all of the dogs she sees Sam. Michelle is demonstrating _______.

a. babbling

b. holophrase

c. underextension

d. overextension

Studies of intelligence in adulthood reveal that fluid intelligence abilities____________ with age, and crystallized intelligence abilities ____________ with age.

a. increase; increase

b. increase; decrease

c. decrease; increase

d. decrease; decrease