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