Read the paragraph then answer the question: (1) The coral reef is a beautiful underwater landscape. (2) Coral is a actually a type of animal made of polyps that filter feed off small plants and microscopic animals that float through the current. (3) Many other animals live here as well including turtles, sharks, and 1,000s of types of fish. (4) The coral can be hurt by too much carbon dioxide being dissolved in the water from the air above. (5) If the coral dies, the reef becomes bare rock and sand no longer full of life.

Which sentence above BEST shows how the atmosphere is a part of the coral reef?

(2) Coral is a actually a type of animal made of polyps that filter feed off small plants and microscopic animals that float through the current.

(3) Many other animals live here as well including turtles, sharks, and 1,000s of types of fish.

(4) The coral can be hurt by too much carbon dioxide being dissolved in the water from the air above.

(5) If the coral dies, the reef becomes bare rock and sand no longer full of life.