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