Physical immaturity is exaggerated in humans, who devote about _____ percent of their total years to growing

Which of the following statements about how infants perceive the structure of speech is true?

A) Rules that infants extract from the speech stream do not generalize to nonspeech sounds. B) Parents must directly teach word-order rules for infants to understand the basic grammar of their language. C) Infants locate words by discriminating syllables that often occur together from syllables that seldom occur together. D) Infants do not become sensitive to the speech structure of individual words until after their first birthday.

Amniocentesis can be conducted after

A) the zygote has divided more than twice. B) the 4th week of pregnancy C) the 14th week of pregnancy. D) the birth of the baby.