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