According to the author of “Mysterious Oceans,” what is one of the mysteries of the sea?

A.
Only about five percent of the world’s oceans have been studied fully.

B.
Some sea creatures live where there is no sunlight and hardly any food.

C.
The Giant Squid was not seen alive until just a few years ago.

D.
There are different kinds of starfish.

(HELP.)

A)   Only about five percent of the world’s oceans have been studied fully.

Explanation:

Because of the depths of the oceans, we know very little about them. And why haven't scientists looked at the other 95% of them yet?

In my research I have discovered, there are two main reasons why ocean exploration is difficult. For starters, the technology that is being utilized to map the seas and ocean floors are still in its infancy. It has only been in the last 50 years or so that ocean exploration has benefited from the use of ocean satellites, scientific buoys, deep-sea submarines, and sophisticated sonar. And, as technology advances, scientists have been able to find more of the seas and map a higher percentage of the ocean's floor as a result of their efforts.

Nonetheless, even with technological advancements, there remains a significant hurdle, namely the vastness of the ocean itself. Consider the following: The ocean is seven miles deep at its deepest point. Abyss is located near Guam in an area known as the Mariana Trench, which is a popular yacht charter destination because it is close to many other yacht charter sites.

explanation:

the answer its b i got it right when i did it trust