Some plants of the tundra can perform photosynthesis at lower than normal light levels.
All of the above
Dense fat, with thick fur that covers all external surfaces
Special bones in their nose that help them save water
Keeping their extremities relatively cold
30%
20%
10%
50%
The animals try to keep up with the newest styles
The cold causes fur to change colors
The changing fur has no real purpose
Shedding one color coat for another helps them stay camouflaged in most seasons
Cold
Lots and lots
Barren
Treeless plain
Tundra can be found on the tops of some mountains.
Any frozen soil
Permanent frost
What happens to plants when they freeze
Soil that stays frozen for two or more years