Ahas some kind of unity in terms of terrain, climate, government, language and so on

Region

Explanation:

Region is a geographical area that is divided into sections such as physical, human and environmental geography, and it crates interaction between humanity and the environmental set up. It can also be used in different geographical areas that have limited access to government funding. However, regions have a relevant feature with language, climate or even terrains

The parts are typically characterized by unique and distinct properties from both the outside and inside. The sub-regions are also defined by the transitional boundaries which are different from the law.

the correct answer is blue and green.

a visible spectrum is electromagnetic spectrum color that can be seen by a normal human being by a single wavelength of light. the visible light spectrum is the range of wavelengths that make up visible light. the visible light spectrum passes through a prism enabling the rainbow reveals all the colors in the spectrum. these range from red, orange, yellow, green, blue and violet.

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.