A heater is placed along the side of an aquarium. A convection current will transfer heat throughout the aquarium as___. A. Hot water rises and cold water sinks
B. Hot water sinks and cold water rises
C. Hot water spreads from the heater in all directions
D. Water rises and sinks in an ever-changing pattern

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve