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

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.

Ecosystems, made up of living and non-living things, can be as small as a tide pool or as big as a rainforest. Ecosystems can be classified as terrestrial or aquatic, with aquatic further divided …

Terrestrial ecosystems can be further grouped into broad categories called biomes, based largely on climate. Examples of terrestrial biomes include tropical rain forests, savannas, deserts, …

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 …

The climate and the plants in a biome determine what animals live there. This article addresses the climate and biodiversity of one of Earth’s most diverse and iconic biomes: the tropical …

Oops. Something went wrong. Please try again. Uh oh, it looks like we ran into an error. You need to refresh. If this problem persists, tell us.

Explore 6th grade science topics with interactive lessons and practice exercises on Khan Academy.

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

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.