Which of the following are limiting nutrients ?
water
carbon
nitrogen
phosphorus

Nitrogen and Phosphorus

Explanation:

When the function of a whole ecosystem is limited because of a nutrient , which is present in limited amount, it is called as a limiting nutrient. The organisms uptake water and carbon directly from the environment as it is abundant in nature. The nutrients like nitrogen and phosphorous are present in limited amount and moreover they are not present in the form that can be directly taken up by the organism.

Thus, Nitrogen and Phosphorous are limiting nutrients.

answer; ///i do believe that the correct answer is (c) hold atoms together to form compound;

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme