Tundra ecosystems are considered to be fragile because of

ANSWER: The deserts, tropical forest, and tundra are considered to be fragile ecosystems because of the long regeneration time when vegetation has been destroyed.

Fragile, yes. Not necessarily unstable unless we humans mess it up. The reason it's fragile has to do with the cold temperatures and difficult growing conditions, HOPE THIS HELPS!! :)

The answer would be sand and gravel

It's cell theory. easy name i would think.