Explain the difference between a parliamentary system of government and a presidential system of government

A key difference between presidential and parliamentary systems lies in the power to remove a chief executive or to dissolve the legislature. In parliamentary systems, the chief executive's term of office is directly linked to that of the legislature, while in presidential systems the terms are not linked.

Explanation:

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

the answer is:

carbon dioxide