This document discusses different types of ecosystems including forests, deserts, jungles, ponds, the North Pole, oceans, rivers and lakes. It notes that forests provide shelter and food for animals, grasslands are home to many herbivores, and deserts have little rain so not many living things can survive there. The document also explains that saltwater ecosystems are in oceans and seas while freshwater ecosystems are in rivers and lakes. Finally, it states that living things in ecosystems depend on each other for food and form food chains.