The circulation of water in the ocean due to differences in density between the different layers of water is most likely responsible for a the ebb and flow of the tides b deep water ocean currents c the eruption of under water volcanoes d all of these

The circulation of water in the ocean due to differences in density between the different layers of water is most likely responsible for "B deep water ocean currents" The moon is responsible for the tides, and under water volcanoes will erupt regardless of the water density.

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature