4

Polar

2

Warm Grasslands! Savanna

2

Treeless Plains! Steppe

4

Desert

4

Aquatic

2

Frozen Ground! Tundra

2

Hot and Wet! Tropical Rainforest

2

Water Everywhere! Aquatic

3

Marie Curie

2

Hot and Dry! Desert

3

States of Matter

2

Four Seasons! Deciduous Forest

2

Snow and Ice! Polar

2

Evergreen Forests! Taiga