They have toxic chemicals
Ants protect them
They have thorns
A combination of the above defenses
Winter and summer
Dry and wet
Winter and fall
Spring and summer
Asia
Antarctica
Australia
North America
Growing quickly
All of the above
Developing fire-resistant cover
Having deep roots
Grassland
Temperate forest
Desert
Tundra
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
Midlatitudes
Rain shadows
Bajadas
Different temperatures