<u>Biodiversity</u> is the biological variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.
Biodiversity is important to humans for ecological life support, biodiversity gives a functioning ecosystem that provides oxygen, clear air and water, plant pollutions, pest control, wastewater treatment and lots of ecosystem services.
Kuroshio Current is the only option shown in the question above that has no relation to thermohaline circulation and refers to a hot sea current that occurs in conjunction with the cold sea current known as Oyashio. Kuroshio Current is also known as the Japan Current, because its action usually encourages the appearance of shoal on the Japanese fishing coast.
