How to convert decimals to scientific notation

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.

The two isotopes of chlorine are 3517cl and 3717cl. which isotope is the most abundant?

Ahas distinct properties and composition that never vary.