(Q).
Warm water cant hold as much dissolved oxygen as cool water, so an increase in the temperature of water decreases the amount of oxygen it contains.  The warmest or coldest waters have the least dissolved oxygen?
(A).
warmest


(Q).
If the gas is heated, the particles will move faster as they gain more energy.  If John heats a gas in his bunsen burner, what would happen to the gas particles they would move faster or they would move slower?
(A).
they would move faster


(Q).
Water becomes more dense when it is colder and when it has more salt.  What happens to water when it absorbs salt lower density or Higher Density?
(A).
Higher Density