The answer could be either B or D. Both are important for marine biology. I would have to say D is the best answer though!
Answer:
i think it's the double helix
Explanation:
Answer:
The nucleus contains a cell's DNA.
The one that is true about cells is Number two. The cell is the basic unit of a structure and function of life. The cells are what makes us living things. All living things are made up of cells.
