Scrambled Sentences

1. It allows plants to convert sunlight into energy.
2. Photosynthesis is an essential process for life on Earth.
3. Without it, most food chains could not exist.

Correct Order

2 - 1 - 3

Solution

1. Sentence 2 introduces photosynthesis and can stand alone.
2. In sentence 1, 'It' refers to photosynthesis.
3. Sentence 3 continues the same reference with 'it' and gives its consequence.