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