Marine organisms trying to live in the water may not get enough oxygen to survive. Based on this description, which of the following is true?

Scientists recently found three animal species living two miles below the surface of the Mediterranean Sea. They’re multicellular, which means their bodies have many cells. They’re also tiny. Each is about the same size as a large grain of sand. They look like tiny umbrellas with legs. But they are animals.  

Explanation:

The most exciting thing about these creatures, say the scientists, is that they apparently don’t need oxygen to live. What biologists know about life so far is that only single-celled organisms can live in places that have no oxygen. Multicellular organisms can visit these places, but not live there. These newly found creatures could change that idea.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

the answer is 100% density i've answered this question before and done the quiz myself.