Stories often include many types of conflict! Stories can be as complicated as the one who writes it wants. There are no other rules here
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A bigwig refers to a person who is an expert in a particular area of study or field. Thus, a bacterial wig will be someone who is an expert in the area of bacteriology. Such a person will probably have the highest degree that is obtainable in that field and will be an authority to reckon with when it comes to the issue of bacteria.
Pangaea was a giant continent, it had almost all the continents we know as today. Pangaea later broke apart because of the plate tectonics and Africa separated from South America, India separated from Antarctica, North America separated from Europe, Australia moved away from Antarctica, and India moved away from Madagascar. India also later ran into Eurasia forming the Himalayas.
