Your friend jane just returned from the doctor, who diagnosed her with a specific vitamin b toxicity. however, she doesn't recall the name of the vitamin.
which of the following is the only possible culprit associated with toxicity symptoms?

a. niacin
b. biotin
c. riboflavin
d. vitamin b12

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.