Week 4
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The Week 4 Ecosystem page lists all biomes extant in Week 4 and which organisms are present in each.
Maps
Topography
Regions
Biomes
Unlabeled Biomes
Rivers
Watersheds and Seep Zones
Ocean currents
Caves over watersheds
Caves over biomes
Flyways
Events
Week 4 opened with a mass extinction event caused by atmospheric oxygen and bioavailable nitrogen levels crashing. See the EBAD announcement for more information.
As in previous weeks, numerous species dispersed across flyways to islands and nearby coasts.