The Saudi Arabia politics are take place in the context of a totalitarian absolute monarchy with some Islamic (Wahhabi Islam) lines, and the King is both the Saudi Arabia's head of state and absolute monarch (i.e. he is the head of government). The King also serves as the head of the Saudi royal family, the House of Saud, which is also why the country bears the name that it has.
It doesn't sound important
The second one is correct
The correct answer is - microscope.
In order to be able to compare and study close up looks of feathers from different types of birds, Amira will need to use a microscope. The purpose of the microscope is exactly that, to be able to see close up looks and compare and study the things better, and since the microscope has the ability to zoom in multiple times it is the perfect tool for it.
The answer is Greenhouse gases
Greenhouse gases absorbs and emit radiation within thermal infrared range . This process create a condition which commonly known as the greenhouse effects, keeping the earth at a moderate temperature.