Most of the earth's surface is covered by oceans, and life is born in the oceans. However, it is estimated that 80% of Earth's species live on land, compared to only 15% in the oceans and the remaining 5% in freshwater. The researchers believe that the physical layout of terrestrial habitats may be more fragmented than the ocean, which is one of the main reasons for the greater diversity of terrestrial species.
The statement that "the deep sea is basically like a refrigerator relative to the shallow, sunny coastal areas, and the door has been closed for a long time, and the species is far less abundant than the shallow sea" would most strengthen the researcher's argument.