Question

ocean are useful to man in different ways

Answer 1

yes, as Oceans are the lifeblood of planet Earth and humankind. They flow over nearly three-quarters of our planet, and hold 97% of the planet's water. They produce more than half of the oxygen in the atmosphere, and absorb the most carbon from it.

Hope this will help you :-))

Biee ^_^

Answer 2

fishing, electric current etc