Hello!
The answer to your question is A.
By wavy lines of characteristic shapes
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To store this important material, DNA molecules are tightly packed around proteins called histones to make structures called chromosomes. The DNA that contains your genes is stored in your cells in a structure called the nucleus.
The Arctic fox is specifically made to survive extreme cold weathers, it has a very thick fur coat that keeps it very warm. Also, Arctic foxes change the color of their fur with the seasons. In winter they are white to blend in with the snow, while in the summer they change to brown. Hope this helps.