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