The preserved dead remains of the extinct organisms in earth's crust are called_______

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term used to describe the preserved dead remains of extinct organisms found in the Earth's crust.

2. **Identifying Key Concepts**: The key concepts here are "preserved dead remains," "extinct organisms," and "Earth's crust."

3. **Defining the Term**: The preserved remains of extinct organisms are commonly known as "fossils." Fossils can include not just the remains of the organisms themselves, like bones or shells, but also traces such as footprints or imprints.

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