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