One way calcium carbonate and magnesium silicate are alike is that both - A.
contain four atoms of oxygen
B.
are made of only nonmetal elements
C.
have three different eleinents
their formulas
D.
o
have five atoms in each one of their molecules

C. have three different elements in

their formulas

Explanation:

Calcium carbonate and Magnesium silicate are two inorganic chemical compounds with the chemical formula: CaCO3 and MgSiO3 respectively. Using their chemical formula as a basis, CaCO3 consists of atoms of three different elements i.e. calcium element (Ca), carbon element (C) and oxygen element (O).

On the other hand, MgSiO3 also contains the elements: Magnesium (Mg), silicon (Si) and oxygen (O). Based on the elemental composition of both inorganic compounds, it can be observed that similarly BOTH HAVE THREE DIFFERENT ELEMENTS IN THEIR FORMULAS.