List the names of all regions and their corresponding wavelengths of the entire electromagnetic spectrum?

Explanation:

The electromagnetic radiation consists of 8 types of waves which are given along with their wavelength as below  

gamma-rays-  < 10^(-12) m

x-rays         -    1 nm - 1 pm

Ultraviolet-  400 nm - 1 nm

Visible         -  750 nm - 400 nm

near-infrared     -            2.5 μm - 750 nm

Infrared         -  25 μm - 2.5 μm

Microwaves-  1 mm - 25 μm

radio waves     -           > 1 mm

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.