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