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