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 .

c is the answer to this question. altitude affects the weather because air molecules evaporate.

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bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )