Which amusement park ride utilizes periodic motion a. slide b. bumper cars c. giant swing d. roller coaster

Giant swing

Explanation:

Period is the time taken to complete one cycle. Periodic motion means a repeated motion in equal intervals of time. A giant swing is the best choice

it is snorkeling, apex verified.

the correct answer is moro reflex. this is usually witnessed in infants normally up to the age of 4-5 months (in some cases maybe more)  

it is caused by a sudden loss of support that makes the baby feel as if he or she is falling or is going to fall and hence the flinging of the arms and crying.