Explanation:

- Mosses: These are non-vascular, small, green plants that typically form dense green clumps in moist environments. They do not grow tall like trees.

- Pteridophytes: This group includes ferns and their relatives. They are vascular plants but do not produce seeds. They can be relatively tall, but not as tall as redwoods.

- Liverworts: Liverworts are small, non-vascular plants similar to mosses. They grow flat and close to the ground, showing no resemblance to trees.

- Gymnosperms: This group includes conifers, which are seed-producing plants. Redwoods fall under this category, as they are some of the tallest tree species.