PLEASE HELP Explain how DNA is involved in creating genetic variation within a species. Is this considered a mutation, if so why?

different strands creates different human characteristic

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

my teacher would say no s