Read the sentence below and complete the instruction that follows.

constellations, groups of stars, provide astronomers with a roadmap of the galaxy.

identify the appositive or appositive phrase.

groups of stars
constellations
with a roadmap
astronomers

The answer is A: group of stars

 The words group of stars have the function of providing information about constelations, explaining what constalations are. When a word or a phrase have this function in a sentence, they are called appositive or appositive phrase, and they should appear between commas as those used in the example.

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

thousands of people

explanation: