Use the drop-down menus to select the correct answers. DNA is packed tightly into . are types of atoms that link one strand of DNA to another. The DNA structure is formally called the .

explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.

what is the question? is it 'what is one of the reasons that someone could be b12 deficent?