Which biome is characterized by permafrost ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Biomes**: A biome is a large ecological area on the Earth's surface, with flora and fauna (plants and animals) adapting to their environment. Different biomes are characterized by different climates, vegetation, and soil types.

2. **Identifying Permafrost**: Permafrost is a thick subsurface layer of soil that remains frozen throughout the year, occurring in polar regions and high mountains. It is a key characteristic of certain biomes.

3. **Comparing Biomes**: There are two main cold biomes to consider: the tundra and the coniferous forest (taiga). The tundra is characterized by extremely low temperatures, short growing seasons, and limited vegetation.

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