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