What were the characteristic of life forms that had been fossilised ?

Explanation

### Step-by-Step Solution:

1. **Definition of Fossils**: Fossils are the preserved remains or traces of organisms that lived in the past. They are typically found in sedimentary rocks and provide evidence of life forms that existed long ago.

2. **Characteristics of Fossilized Life Forms**:
- **Physical Structures**: Fossilized organisms often exhibit physical structures such as teeth, bones, and sometimes soft tissues. These structures help in identifying the type of organism and its biological characteristics.
- **Presence of Crystals in Plants**: Some fossilized plants contain crystals which played a significant role in their survival. These crystals helped the plants to withstand extreme environmental conditions, such as high pressure and temperature.
- **Adaptation to Environment**: Fossilized life forms show evidence of adaptation to their environments. The presence of crystals in plants, for instance, indicates their ability to adapt to high-pressure conditions, which suggests that they were well-suited to their habitats.
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