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