Growing quickly
All of the above
Developing fire-resistant cover
Having deep roots
Spring and summer
Winter and summer
Winter and fall
Dry and wet
The savanna gets a fair amount of rain, at least 20 inches a year.
Antarctica
North America
Australia
Asia
Tundra
Temperate forest
Grassland
Desert
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