This document contains an ecosystems review for a 5th grade natural science class. It includes multiple choice and true/false questions about different ecosystem types like tundra, desert, rainforest, and more. It tests students on defining key terms like ecosystem and habitat, identifying characteristics of different ecosystems, and matching examples of plants and animals to their ecosystem. The review covers topics like abiotic and biotic factors, populations, communities, and aquatic vs. terrestrial ecosystems.