This document describes several ecosystems: marine, desert, forest, urban, and savannah. The marine ecosystem is home to fish and sharks and covers much of the Earth. The desert ecosystem, like the Sahara, is very hot with little water and animals such as scorpions and camels. The forest ecosystem receives a lot of rain and is inhabited by trees, monkeys, tigers, and other plants. The urban ecosystem contains houses, buildings, and rivers passing through cities. The savannah ecosystem has some trees but is home to many large animals.