What about the diagram shows that the sound wave is a mechanical wave

Ijust want the meaning to life (no wrong or right answers i just want your true opinion)

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.

How are medical providers most likely to be grouped for searches? check all that apply. -coverage -specialty -age -competence -need