A savanna or Savannah is a mixed woodland-grassland ecosystem characterized by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses.
In physical geography, tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes through Russian тундра from the Kildin Sámi word тӯндар meaning “uplands”, “treeless mountain
Life in the Tundra
https://beyondpenguins.ehe.osu.edu/issue/tundra-life-in-the-polar-extremes/life-in-the-tundra
https://www.dkfindout.com/uk/animals-and-nature/habitats-and-ecosystems/african-savanna/
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