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