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