Which geological feature plays a role in determining the boundary of watersheds? a)River systems
b) Ridge lines
c) Tributaries
d) Flood plains

tributaries

Explanation:

mammal

explanation:

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.