State the oxidation number assigned to each bold element in the formulas below. 1. S
​ 2. Mg+2
​ 3. F2
​ 4. H2O
5. FeCl2
​ 6. Fe2O3
​ 7. SO4-2​
8. NH4+1

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory