Which of the following 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

a. a clone will be physically identical to the original, but won’t be genetically identical

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the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

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