The biome that does not have trees as a climax community is the tundra.

Here's why:

* Harsh Conditions: The tundra is characterized by extremely cold temperatures, permafrost (permanently frozen ground), and limited growing seasons.

* Tree Growth Limitations: These harsh conditions make it difficult for trees to establish and grow. The permafrost prevents deep root systems, and the short growing season limits photosynthesis.

* Dominant Vegetation: The tundra is primarily dominated by low-lying vegetation like grasses, mosses, lichens, and dwarf shrubs.

Let me know if you have any other questions about biomes!