They are close to the equator, another reason is because of the tropical maritime location, temperature changes throughout the region are generally small.
Maybe size or mass .........
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 Equator divides the south and the north pole so they cant be conjoined