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