Remains of hard parts of life form found in rocks are

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the remains of hard parts of life forms found in rocks.

2. **Understand the Context**: These remains are typically found in specific types of rocks. The type of rock that commonly contains these remains is sedimentary rock.

3. **Define the Term**: The remains of hard parts of life forms found in rocks are known as fossils.

4. **Explain Fossils**: Fossils are defined as the preserved remains or traces of organisms that lived in the past. This can include remains from animals, plants, or other life forms.

5. **Types of Fossils**: The types of remains that can be found as fossils include bones, shells, and imprints of organisms in stone.

6. **Significance of Fossils**: Fossils are crucial for understanding evolution as they help trace the evolutionary history and relationships between different organisms.

7. **Final Answer**: Therefore, the remains of hard parts of life forms found in rocks are called fossils.