Rearrange the following sentences to form a meaningful passage: 1. Photosynthesis in algae underpins nearly half of global oxygen production. 2. Microscopic in size, algae occupy virtually every aquatic environment on Earth. 3. Their photosynthetic efficiency makes them candidates for biofuel development. 4. Algae convert sunlight and carbon dioxide into organic matter through chlorophyll.

2 - 4 - 1 - 3
1 - 4 - 2 - 3
4 - 2 - 1 - 3
2 - 1 - 4 - 3

Correct answer: 2 - 4 - 1 - 3

Solution

Sentence 2 introduces algae generally. Sentence 4 explains what algae do, sentence 1 states their global importance, and sentence 3 gives a practical application based on that efficiency.

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