1. The document compares different ecosystem types and their climates. It discusses desert, forest, ocean, and wetland ecosystems.
2. Desert ecosystems are very hot and dry, receiving little rain. Animals and plants have adapted to survive, such as camels storing water in humps and desert animals hiding from the sun.
3. Forest ecosystems include tropical rainforests, which are hot and wet year-round, and temperate forests, which are warmer in summer and colder in winter with less rain than rainforests.