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