Q: As the amount of water increases, the melting point of rock decreases. Richard dropped two identical rocks, one into a puddle, and the other into a swimming pool. After dropping both rocks, the rock dropped into the swimming pool had a higher melting point than the other rock or a lower melting point than the other rock?
A: a lower melting point than the other rock

Q: Thicker wires offer less resistance. Jill had two wires in her lab, one was twice the thickness of the other and she measured the resistance of each. She saw that the thicker or thinner one showed less resistance?
A: thicker

Q: Bacteria with a mutation the helps resist antibiotics increase in numbers, so the mutation becomes more common. Eric notices an increase in antibiotic resistance in a certain bacteria. The mutation that causes the resistance has become more or less common?
A: more

Q: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react. If Mona has filled a balloon with helium and she removes some gas from it, what happens to the likelihood that the helium particles will collide with each other more likely or less likely?
A: less likely