How have submersibles benefited ocean exploration?
a.
they allow exploration of arctic waters.
b.
they reduce the expense of ocean exploration.
c.
they allow the deep ocean to be explored.
d.
all of the above

The answer is c. They allow the deep ocean to be explored.

Thanks to submersible technologies, the exploration of the deep ocean is now possible. This brought a discovery of new deep-sea environments. It was hard to believe that in such deep-sea environment, without a light and with enormous pressure, the life may exist, but submersibles showed that it is possible.

Ithink its deforestation.

It is c. naturally in the environment