Which word in the sentence is an example of an adverb? endangered
elephant
lives
contentedly

"contentedly" is basically another way of saying "happily"

This word modifies the verb "lives". It describes in more detail how the animal lives, rather than just simply saying "the elephant lives"

elephant = noun

endangered = adjective, since it describes the noun (elephant)

mailman is the most possessive answee

to show how the cables work.