Which model of matter says matter can be divided in half forever, never reaching a smallest piece?

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

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