Why are cancer causing factors in lifestyle and environment difficult to identify

In the practice of science, this type of reasoning is used to develop explanations.

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations

Bob, a nutritionist who works for the university medical center, has been asked to prepare special diets for two patients, susan and tom. bob has decided that susan's meals should contain at least 320 mg of calcium, 17 mg of iron, and 42 mg of vitamin c, whereas tom's meals should contain at least 280 mg of calcium, 13 mg of iron, and 34 mg of vitamin c. bob has also decided that the meals are to be prepared from three basic food