How many total events are there on the social readjustment rating scale?

Which of the following statements best represents the evidence of the cephalocaudal principle in newborns?

A) The head represents one-fourth of a newborn's total length but only one-eighth of an adult's height. B) Exposure to PCBs in breast milk has been linked to a variety of neurological impairments. C) Toward the end of the first year of life, infants enjoy finger foods, such as cheese and sliced fruit. D) Babies who are breastfed are at a lower risk for a variety of infant diseases and illnesses.

According to the text, the human body contains about how many different types of cells?

a. 16 b. 50 c. 200 d. several thousand