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