After two elements react to completion in a closed container, the ratio of their masses in the container will be the same as before the reaction. which law describes this principle

law of conservation of mass

Explanation:

Law of conservation of mass -

This law was given by the father of chemistry ,  Antoine Laurent Lavoisier .

According to this law ,

The mass of the system remains constant , i.e. , mass can neither be created nor be destroyed , is known as the law of conservation of mass.

In a chemical reaction , the mass of the reactant always equalizes with the mass of the product.

Hence , from the given information of the question ,

The correct term is the law of conservation of mass.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer