The reason you should never ever drink sea water is that it is extremely bad for your kidneys. The salt in the sea water sucks water out of you and the salt absorbs it. If you drank sea water it will dehydrate you very very much, and it will do this because your urine is less salty than salt water. So the salt will absorb more water than it should and take water out of you every time you drink saltwater. So in conclusion, do not drink salt water because it will only dehydrate you.
The ocean is important to life on earth because it supplies us with vital resources for life. It does this by making more than half of our oxygen and also housing a very high percentage of our animals hear on earth. There fish in it that we eat. There are phytoplankton that supply us with more than half our oxygen. It stores carbon dioxide for us so we are less likely to get sick from it. Lastly, the ocean is important because it is more three fourths of our water, but we can't drink it at least we can care for it so we can live.
Oceans currents effect the earth's climate quite drastically. It does this by moving the warm water from tropical areas to the colder pole areas and the cold from the pole areas to the tropical areas. this effects the climate because it cools off the tropical areas and warms up the pole areas. Also the majority of the suns heat is absorbed by the ocean, like an aquatic solar panel. Without this much more of the earth would be uninhabitable.
There are five depth zones in the ocean, the sunlit zone, twilight zone, midnight zone, Abyss, and hadal zone. The first one, the sunlit zone, Is 0-656 feet deep getting sunlight making it rich habitability. These inhabitants include manta rays, sharks, sea lions, sea turtles, seals, the most plants, and many many fish. The twilight zone is 656-3,280 feet deep and only gets dim light and no plants grow. The animals that live in this zone include jellyfish, octopuses, and squid. The middle zone is the midnight zone, which is 3,280-13,123 feet deep. Also this zone doesn't get any sunlight and some animals that live here don't even have eyes. Its inhabitants include viper fish, anglerfish, snipe eel, and tripod fish. The next zone is the abyss which is 13,123-19,685 feet deep; so basically the deep sea which is so short in habitability and most creatures here lack a backbone including sea spiders with other residents like blind shrimp and hag fish. The last zone is the hadal zone which is 19,685-36,197 feet deep; so basically all the deep crevices in the ocean. This zone is barely above freezing but still some life exists here like sea cucumbers.
One of the important things to remeber about the ocean is that it can be dangerous and I do not mean sharks. What I am talking about is the fact that the pressure increases and the temperature decreases the deeper you go making it deadlier and deadlier. Each 10 meters the atmospheric pressure increases by one so every 10 meter it is more pressurized by one atmosphere. The temperature can give you hypothermia and if you get that it is more likely you will die in the ocean than get to the surface if you are deep enough, but it you have the right equipment you should be fine.
We get many many resources from the ocean including crude oil, coal, salt, gravel, mangese, copper and nickel. These give us plenty of recreation in the ocean, but it also is important to care for the animals living there too. Every year millions of animals die from crude oil poisoning and it's because of us. We need to find area were the birds and sea animals are migrated and do the drilling then.