Ecosystems change with altitude in mountainous regions due to variations in temperature, precipitation, and soil conditions. As altitude increases, temperatures drop, leading to changes in vegetation types and biodiversity. This results in distinct vegetation zones known as montane, subalpine, and alpine zones. Each zone is characterized by specific plant and animal species adapted to the unique environmental conditions at different altitudes. Additionally, soil composition and moisture levels differ with altitude, further influencing the distribution of species in mountainous ecosystems.