Erection is best described as a:

a. Spinal reflex

Which of the following is true of morphological inflections

a. they are omitted in telegraphic speech b. they include verb endings for person and tense c. children sometimes add them where they don't belong d. some of the above e. all of the above

Which of the following would be the most concerning when conducting research in hospital or

pediatric settings? A) Sample representativeness. B) External validity. C) Access to hard-to-locate populations, such as preterm infants. D) How to keep track of your infants when they come back for "well baby" visits.