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