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