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