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