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