The biosphere is the part of Earth where life exists. It includes all living organisms, as well as the non-living components of the environment that support life, such as air, water, and soil.

The tundra is not a major biome of the Earth. It is a cold, treeless region found in the Arctic and Antarctic regions.

The ocean is the largest biome on Earth, covering over 70% of the Earth's surface.

Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

Decomposition is the process by which organisms break down organic matter into simpler substances.

A food chain is the transfer of energy from one organism to another through a series of organisms, with each organism eating the one below it.

A food web is the interconnected network of food chains in an ecosystem, showing the feeding relationships between different organisms.

A trophic level is the level of an organism in a food chain or food web, based on its position in the transfer of energy.

An ecological pyramid is a graphical representation of the trophic levels in an ecosystem, showing the amount of energy at each level.

Adaptation is the process by which organisms adapt to their environment, through changes in their physical or behavioral characteristics.

Speciation is the process by which new species are formed, through the accumulation of genetic differences between populations.

Ecology is the study of the interactions between organisms and their environment.

A population is a group of organisms of the same species that live in the same area.

A community is a community of different species that live in the same area.

The biosphere is the largest level of organization in the biosphere, encompassing all living organisms and their interactions with the environment.