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.

A

Explanation:

The other answers hardly can be called mysteries.

B is a known fact

C and D are statements

So the reason why the author talks about the mysteries of the sea is simple: only 5 percent of the world´s oceans have been studied, therefore the other 95 percent remains a mystery.

Sorry if im late lol ,

the answer is D.  

There are different kinds of starfish.

Explanation:

b. some see creatures live where there

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

what is the book idiot with the brocken tester