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The differences in how vascular and nonvascular plants obtain water do play a key role in their respective heights. Vascular plants have specialized tissues called xylem and phloem, which allow water to be transported from the roots to the rest of the plant. This efficient water transport system enables vascular plants to grow taller because they can access water from the soil and distribute it upwards. In contrast, nonvascular plants lack these specialized tissues and rely on osmosis and diffusion to absorb water directly through their cells. This method is less efficient in transporting water over long distances, limiting their ability to grow tall compared to vascular plants.

The way vascular and nonvascular plants get water affects their heights. Vascular plants have xylem and phloem to transport water, allowing them to grow taller. Nonvascular plants lack these tissues, so they can't grow as tall.