Which of the following are organic substances that are essential for normal body growth and maintenance and resistance to infection?

Computer systems should be kept in cool, dry places out of the sunlight and away from damaging items

Indicate whether the statement is true or false

Verbal skills are well maintained until age ________, after which some healthy elderly persons gradually develop reductions in vocabulary, tendencies to make semantic errors, and abnormal pronunciation

a. 60 b. 70 c. 80 d. 90