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