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