Primary decomposers are 1. fungi. 2. plants. 3. trees. 4. bacteria. 5. animals.

The correct answer is option 1. fungi.

Explanation:

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Let's analyze each of the options:

1. fungi: they are the main decomposers 2. plants: they are not decomposers, they feed on soil nutrients.

3. Trees: they are not decomposers, they feed on soil nutrients.

4. bacteria: they are not primary decomposers

5. Animals: they are not decomposers, they feed on plants.

After the analysis, we conclude that the correct answer is option 1. fungi.