Humans have been researching for hundreds of years

There are many creatures in the ocean. It is estimated that there are thousands of creatures in the ocean. Some of them have been studied by man, while others are still being used by humans. It cannot be spent. There are so many stolen things in the sea that it is surprising. The ocean is kilometers deep. Here there is only darkness. Man has gone out a lot to get vegetables and his hands are very dirty. The reason is different. Sea creatures are different