Biosphere and Tundra

Biosphere noun - The regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist.

Tundra and biosphere are semantically related. In some cases you can use "Tundra" instead a noun "Biosphere".

Tundra noun - A broad area of level or rolling treeless country.

Biosphere and tundra are semantically related. Sometimes you can use "Biosphere" instead a noun "Tundra".