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