The periodic table displays a. only the important compounds that exist in the world. b. only the important elements that exist in the world. c. all of the known elements that exist in the world today. d. all of the known compounds that exist in the world today.

all of the known elements that exist in the world today.

Explanation:

The periodic table is arrangement of elements based on the atomic number of elements. It is a periodic arrangement of physical and chemical properties of elements. So far we have 118 elements in the modern periodic table.

The compounds are formed from these elements arranged in periodic table. Thus we can say that it displays all of the known elements that exist in the world today.

The Law of Superposition states that in a layered, depositional sequence (such as a series of sedimentary beds or lava flows), the material on which any layer is deposited is older than the layer itself. Thus, the layers are successively younger, going from bottom to top.

Explanation: