Gymnosperm called as a living fossil is

Options

A. Cycas
B. Ginkgo
C. Juniperus
D. both a and b

Explanation

### Step-by-Step Solution:

1. **Identify the Category**: The question asks for a gymnosperm that is referred to as a "living fossil." Living fossils are species that have remained relatively unchanged over long periods and resemble their ancient ancestors.

2. **Understand Gymnosperms**: Gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes. They are characterized by having seeds that are not enclosed in an ovary.

3. **Recognize Living Fossils**: Among gymnosperms, certain species are recognized as living fossils due to their ancient lineage and minimal evolutionary change.

4. **Identify Candidates**: The video mentions two specific gymnosperms that are classified as living fossils: Cycas (often referred to as Cyclus) and Ginkgo.

5. **Conclusion**: Therefore, the gymnosperms referred to as living fossils are Cycas and Ginkgo.

### Final Answer:
The gymnosperms called living fossils are **Cycas** and **Ginkgo**.

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