Which of the following sentences shows a periodic pattern?

a. there are two ducks in one pond

b. there is meat next to the cheese in the refrigerator

c. a boy waits five minutes to talk to his father

d. the mother takes her medication everyday at seven

It is believed that europa, one of jupiter’s moons has an ocean beneath its surface. based on how earth’s oceans and atmosphere are believed to have formed, what can be said about europa’s supposed ocean? the arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced , similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s .

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative

Moving down the ramp from 6 meters to