The first stage in the formation of coal in nature is .......... which contain ......... % of carbon.

Explanation

To answer the question, we need to identify the first stage in the formation of coal and the percentage of carbon it contains.

### Step-by-Step Solution:

1. **Understanding Coal Formation**: Coal is formed from the decomposition of organic material under specific conditions. This process occurs over millions of years and involves several stages.

2. **Identifying the First Stage**: The first stage in the formation of coal is known as **peat**. Peat is an accumulation of decayed plant material that forms in waterlogged conditions.

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