Anarrow strip of land (such as central america) connecting two larger land masses is known as:

An isthmus is a narrow stretch of land between larger masses, such as Panama that connects North and South America, or the isthmus of Kra in southern Thailand.

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.