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