The hygiene hypothesis states that modern children are overprotected from viruses and bacteria, which does not allow their immune systems to strengthen.

The Enlightenment took place in Western Europe in the early 16th century, when reformers Martin Luther and John Calvin challenged papal power and founded the Protestant movement

Indicate whether the statement is true or false

Salma's 1-year-old son hums when he plays with toys. Salma responds to this behavior by smiling and talking to the baby, and so he keeps humming to gain Salma's attention. In the context of the learning perspective on human development, this scenario exemplifies the concept of:

A. accommodation. B. equilibration. C. operant conditioning. D. classical conditioning.