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