2

Ecosystems

4

Taiga

2

Four Seasons! Deciduous Forest

4

Polar

4

Tundra

4

Desert

2

Hot and Wet! Tropical Rainforest

4

Aquatic

2

Evergreen Forests! Taiga

4

Savanna

2

Treeless Plains! Steppe

4

Tropical Rainforest

2

Hot and Dry! Desert

2

Frozen Ground! Tundra

4

Deciduous Forest

4

Montane Forest

3

Lakes of the World

2

Warm Grasslands! Savanna

4

Steppe

2

Water Everywhere! Aquatic

2

Snow and Ice! Polar