Ecosystems can be classified as terrestrial or aquatic, with aquatic further divided into marine and freshwater. Land ecosystems are often categorized into biomes, such as tropical forests or …

Learn AP Environmental Science using videos, and AP-aligned practice. Review the fundamentals of ecosystems, biodiversity, populations, earth systems and resources, land and …

Key points An ecosystem consists of a community of organisms together with their physical environment. Ecosystems can be of different sizes and can be marine, aquatic, or terrestrial. …

Review your understanding of the taiga, tropical rainforest, temperate forest, shrubland, grassland, savanna, desert, and tundra biomes in this free article aligned to AP standards.

This unit explores the Earth as a system with interdependent components, processes, and relationships. Learn about ecosystems, terrestrial and aquatic biomes, natural climate change, …

Apply your understanding of ecosystems and biomes in this set of free practice questions aligned to AP standards

Learn about the levels of organization in the biosphere, including biomes, ecosystems, communities, and populations.

Terms such as individual, population, species, community and ecosystem all represent distinct ecological levels and are not synonymous, interchangeable terms. Here is your brief guide or …

Key points A biome is a community of plants and animals living in, and adapted to, a certain climate. Many of Earth’s biomes are aquatic, or water-based. The characteristics of aquatic …

Examine how life is organized across levels—from populations and communities to ecosystems and the entire biosphere. Explore how biotic and abiotic factors interact across these levels …