Rainforests make up only 3 percent of the earth's surface. Over half the world's plant, animal, and insect species live there.Combine the above sentence with a conjunction that expresses a contrast:

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Rainforests make up only 3 percent of the earth's surface. Over half the world's plant, animal, and insect species live there.
Combine the above sentence with a conjunction that expresses a contrast:

Rainforests make up only 3 percent of the earth's surface, so over half the world's plant, animal, and insect species live there.

Rainforests make up only 3 percent of the earth's surface, therefore over half the world's plant, animal, and insect species live there.

Rainforests make up only 3 percent of the earth's surface and over half the world's plant, animal, and insect species live there.

Although rainforests make up only 3 percent of the earth's surface, over half the world's plant, animal, and insect species live there.

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We can determine the correct answer with the help of logic and by eliminating the incorrect answer.

The subordinating conjunctions used to express contrast in a sentence are though, although, as, however, whoever, whatever and notwithstanding.

And, so do not express contrast. We can thus eliminate options A and C as incorrect answers.

Option D is the correct answer as the conjunction 'although' joins the two sentence to express a contrast.

Option B is incorrect as the conjunction 'therefore' is used to explain cause and effect.

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