Australia
Asia
North America
Antarctica
Spring and summer
Winter and summer
Winter and fall
Dry and wet
Grassland
Temperate forest
Tundra
Desert
Growing quickly
All of the above
Developing fire-resistant cover
Having deep roots
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.
They all migrate in different directions
Their territories don't overlap
They eat different foods
They avoid each other as much as possible