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