Answer:
Due to global warming and ocean levels rising, Earth's ocean was made up of more frozen bodies of water. I wouldn't say Earth had more or less water in the past (because where would the water have come from?) but instead the water was less accessible due to it being frozen in glaciers. Comparing the ocean from 66 million years ago to today, I'd say the water levels have definitely risen since many city are below sea level now. You could say the surface area of the ocean has increased over time.
