which source is the most reliable?

a. a report published on wikipedia

b. an article evaluated by other scientists

c. a blog about plant growth

d. an advertisement about weight loss

b. an article evaluated by other scientists

Explanation:

A reliable source is the source of information that provides the valid argument , discussion, and reason to believe the stated content. The examples of the reliable source involves the reviewed articles or books written by the researchers belonging to the authentic and recognized organizations for public.

An article evaluated by other scientists is the correct option. As an article may exhibit mistakes or may be incorrect on the basis of implemented methodologies and result of the research conducted or the review of the research.

15.Potassium oxide

16.Calcium chloride

17.Aluminium sulphide

18.CaS

Explanation:

15.K is the chemical symbol of Potassium and generally the name of the non-metal at the end of a formula has the suffix '-ide' and since O is oxygen, the name becomes Potassium oxide.

16. The same applies here. Ca is Calcium and Cl is Chlorine but since its the non-metal at the end, it ends in -ide. So Calcium chloride.

17.The same applies here too. Al is Aluminium and S is Sulphur so Aluminium sulphide.

18. Calcium's symbol is Ca and that of Sulphur is S and that gives the formula CaS.