The pull of gravity of causes Earth’s crust and oceans to bulge. This creates high and low tides.

Both the Moon and the Sun exert gravitational pulls on Earth’s oceans, creating tidal bulges that lead to high and low tides. The Moon has the stronger effect because it is much closer to Earth, but the Sun also contributes. So the correct choice is “the Sun and moon.”

AI-written and checked against the verified answer.