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