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