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