Which of the following stages would come first in the life of a star? neutron star white dwarf protostar black hole

Which subshell is represented by the actinides family?

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!

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.