Which of the following is true of infants' ability to differentiate sounds?
A) Infants are born with the ability to ignore small, meaningless variations in the sounds of their native language.
B) Infants can discriminate the sounds of their parent's voices by 3 months of age.
C) By the age of one week, infants perceive differences between speech sounds that are highly similar.
D) By the age of one month, infants reliably discriminate three-syllable words.
Question 2
During early adulthood, _____.
A) cardiovascular capacity can be increased with regular exercise
B) the heart muscles become more flexible, increasing the maximum heart rate
C) the cardiovascular system does not undergo any change
D) the cardiovascular system is at the highest risk of developing congenital heart diseases
true story
Human infants are like all other placental mammals, except they are born at a less developed state.
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Testing Infants’ Knowledge