Norms governing personal space vary according to relationships, cultures, and activities

Which of the following is an example of a potential shared, "age-graded" change in adulthood?

a. a loss of fitness (e.g., aerobic capacity) beginning in the 30s and 40s and continuing into old age b. a decrease in the frequency of contact with siblings between middle age and old age c. a lower average number of years of education among current 25-year-olds than among current 65-year-olds d. a lesser susceptibility to disease among current 65-year-olds than among current 30-year-olds

According to your text, all grammatical markers are missing from ________, the short simple sentences children generally begin to use between 18 and 24 months

Fill in the blanks with correct word