That's correct the costa is right in the Gulf of Mexico and so it touches the central of Mexico it correct
They are not the same age no
Because Cyanobacteria appeared
Cyanobacteria's excrement formed a lot of oxygen in the atmosphere which make the earth temperature cold
This allow a liquid water to formed on the surface ( because if the temperature is too high, the water will evaporate) and eventually formed oceans
You answer would be D bodies of water