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