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