What are the limits to natural selection?

1.a change in environmental conditions , which can lead to such an adaption only for genetic trials already present in a populations genepool , or for traits resulting from mutations

2.heredity

3.Reproduction

variations in physical characters

true is the final answer!

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.