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