Assume that a DNA double helix contains 100 base pairs (one pair is A-T or C-G) and there are 45 cytosines. a. How many guanines are there?
b. How many adenines are there?

Water changes bacteria in the soil converts this nutrient into a usable form. plants take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. an animal eats the plants, and the nutrient becomes part of the animal. when the animal dies, it decomposes, returning the nutrient back to the soil. which cycle is being described? water cycle carbon cycle nitrogen cycle phosphorous cycle