Choose the correct drug to complete the sentence

Which nutrient is the most difficult to break down and, thus, is generally used last fro energy in the body? water carbohydrates fats proteins

What are hormones? a. they are minerals needed for proper bone formation. b. they are the parts of the body targeted by endocrine glands. c. they are substances needed for muscle and nerve activity. d. they are substances released by endocrine glands.

The hydrologic, carbon, nitrogen, and phosphorus cycles are essential to the . this is why they are called biogeochemical cycles.