A "renaissance" man/woman, a polymath, a jack/"Jill" of all trades, someone who is well-rounded.
Who has the time to do social studies homework!
The concept that every member of Parliament stood for the interests of the entire empire was called virtual representation. The essential idea of virtual representation is that one can be represented by a decision-making process without being able to vote.
Among other things, it called for the US to protect its interests abroad through the existence of a strong military. If they think you can successfully invade, they (other countries) are less likely to encroach on your interests abroad. Also the Reagan Doctrine called for obvious and open loyalty to allies.
Paleontologists (the ones who specialize in dinosaur science, anyway) are the ones who study these subjects, if that's what you're asking.
If I understand the question than yes. It is called comparison and contrast. Whether or not they are alike or different will depend on the subjects of course.
All people in England are called subjects of the King or Queen.
A set of books containing information about many different subjects is often called an encyclopedia. They could also be called collectively "Reference Works" if there is more than one type of information, such as dictionaries, maps, encyclopedias, etc.
A person who studies atoms is called an atomic scientist. There are several different branches of science under this category. One of them is a physicist.
Without providing more information (subjects in school, subjects of a kingdom, subjects as parts of speech etc.), subjects also fit into catagories.
The Person Who studies about mamals , he is called mamalogist....
A person who studies volcanoes is called a volcanologist.
Someone who studies evolution is called Evolutionary Biologist.
There is a website called bankrate.com where you can calculate and manage different loan, insurance, and interest rates specifically for automobiles and the like.