Final answer:
The distinguishing characteristic of a temperate grassland is the dominance of grasses and herbaceous plants, created by factors like low precipitation and frequent fires.
Step-by-step explanation:
A distinguishing characteristic of a temperate grassland is the dominance of grasses and herbaceous plants. Unlike forests, which are dominated by trees, temperate grasslands have few trees and are instead characterized by vast expanses of grasses. These grasses and their subterranean parts, such as roots and rhizomes, create very dense vegetation and lead to fertile soils. Factors like low precipitation, frequent fires, and grazing contribute to maintaining these ecosystems largely devoid of trees.