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Choose the word or words that the underlined appositive or appositive phrase modifies in each sentence.

1. Life on earth,"the watery planet",depends on water.
   

ALife

BEarth

1. Water is created by a chemical reaction between two gases, "hydrogen and oxygen".
   

Areaction

Bgases

1. The oceans, "97.2 percent of Earth's water", are salty.
   

Aoceans

Bsalty

4Liquid water, "a substance required by all living things", allows life on Earth to exist.

Aliquid

Bwater