If the tundra topsoil is disturbed:
Dwarf willow takes root
Tundra vegetation quickly reclaims the soil
Permafrost sinks farther beneath the surface
All of the above

Polar bears can triple their spring weight on a diet of:
Arctic char and whitefish
Tundra vegetation
Ringed seals
All of the above

Arctic adaptation of Beluga whales include:
Increased sub-cutaneous fat
An articulated neck
Loss of the dorsal fin
All of the above