From where will you get the most reliable information about the length of life span of an animal ?

Explanation

To determine the most reliable information about the lifespan of an animal, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lifespan**:
- The lifespan of an animal is defined as the duration from its birth to its death. This is a crucial aspect to consider when looking for reliable information.

2. **Identifying Reliable Sources**:
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