Fossils are :

Options

A. animals living in burrows
B. remnants of extinct animals and plants
C. floating organisms
D. fast runners

Answer

**Step-by-Step Solution:**

1. **Understanding Fossils**: Fossils are the preserved remains or traces of organisms that lived in the past. They provide evidence of past life and can include bones, shells, imprints, and other remnants.

2. **Identifying Extinct Organisms**: Fossils specifically refer to the remnants of organisms that are no longer living, meaning they have become extinct. This includes both animals and plants that once existed on Earth.

3. **Analyzing the Options**:
- **Option A: Animals living in burrows** - This option refers to currently living animals. Since fossils are remnants of extinct organisms, this option is incorrect.
- **Option B: Remnants of extinct animals and plants** - This option accurately describes fossils, as they are indeed the remains of organisms that are no longer present on Earth. This option is correct.
- **Option C: Floating organisms** - This refers to organisms that are currently living in aquatic environments. Since fossils are remnants of extinct organisms, this option is incorrect.
- **Option D: Fast runners** - This option describes living organisms that are capable of running quickly. Since fossils pertain to extinct organisms, this option is also incorrect.

4. **Conclusion**: The correct answer is **Option B: Remnants of extinct animals and plants**.