Index fossils are used to determine the of the rock.

a.
age
b.
makeup
c.
color
d.
none of the above

Age

Explanation: Index fossils are used to determine the age of the rock. The definition of index fossil means-a fossil that is found over a relatively short span of geological time and can be used in dating formation in which it is found. Therefore the answer is age.

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.