Asia
Australia
Antarctica
North America
Winter and fall
Dry and wet
Winter and summer
Spring and summer
Grassland
Temperate forest
Desert
Tundra
Developing fire-resistant cover
All of the above
Having deep roots
Growing quickly
The savanna gets a fair amount of rain, at least 20 inches a year.
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 thorns
They have toxic chemicals
Ants protect them
A combination of the above defenses