Yes. Most cities visited by cruise-liners are quite safe, such as Los Cabos or Puerto Vallarta in the Pacific, or Cancun and Cozumel in the Caribbean.
Yes, it is safe. There are marinas in most larger cities along Mexican shores for you to disembark.
Define "safe"
Yes, if you happen to be swimming on the shores of northern Yucatan Peninsula near Cancun, or on southwestern Cuba; those are the boundaries between the Gulf of Mexico and the Caribbean Sea.
Sea Turtles swim in the sea because they eat fish.
No. There could be a lot of poisonous sea anemones and bacteria inside the algae ocean. You can also get tangled in sea plants when you are swimming.
Yes, African Lions can swim in sea, but they only swim if they have to.
There are some parts where you can still swim in the Gulf of Mexico but anywhere along Lousiana, Mississippi, Alabama and most of Texas and Florida's coast, swimming is off-limits and beaches have been closed. Some parts of the Mexico coast are along the Gulf Of Mexico with safe enough waters. Some clean-up workers swim in the Gulf of Mexico as part of their job, but with proper protection.
Salmon swim in the sea. Salmon are fish. Fish love water. The sea is water. Thus, salmon swim in the sea. Voila!
Trout cannot swim at sea.
they swim in the sea but mostly in red sea and in Dubai
jellyfish swim in the sea
yes it is safe
yes it is safe
They swim around and when they sea their food they swim towards it and snap it goes