Why is too much ultraviolet light harmful to plants and animals?

UV radiation is very high energy and is also what's called "ionizing". This means that as it passes through molecules it strips electrons off and thereby breaks the bonds of any organic molecules in the animal. For example, if UV rips through the DNA of cells it can cause real chromosomal damage.

answer: c

explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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