All of the following are characteristics of viruses except: a. viruses are smaller than cells. b. viruses can be different shapes. c. viruses live as parasites. d. viral diseases are curable. viruses are considered to be nonliving because they a. cannot multiply. b. use energy to grow. c. are smaller than bacteria d. do not show all the characteristics of life.

Which of the following is an important function of child-directed speech? (a) it captures the infant’s attention and maintains communication. (b) it reduces the occurrence of infantile amnesia for the earliest memories of infancy. (c) it reduces the need for reciprocal interaction between caregivers and children. (d) it assists in prolonging rem sleep in infants.