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