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