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

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory