Having deep roots
All of the above
Growing quickly
Developing fire-resistant cover
Grassland
Tundra
Desert
Temperate forest
The savanna gets a fair amount of rain, at least 20 inches a year.
Winter and fall
Winter and summer
Dry and wet
Spring and summer
They all migrate in different directions
They avoid each other as much as possible
Their territories don't overlap
They eat different foods
They have toxic chemicals
Ants protect them
They have thorns
A combination of the above defenses
Asia
Antarctica
Australia
North America