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Living matter in total, 7 letters
Organic matter convertible to fuel, 7 letters
Organic matter used for fuel, 7 letters
Organic matter's weight, 7 letters
Plant material used for fuel, 7 letters
Renewable energy source, 7 letters
Plant materials and animal waste used as fuel, 7 letters
The total mass of living matter in a given unit area, 7 letters
Community of plant and animal life, 5 letters
Complex ecologic community, 5 letters
Controlled community, 5 letters
Ecological community, 5 letters
Ecological formation, 5 letters
Grassland or rain forest, 5 letters
Major ecological community, 5 letters
Major geographic region, 5 letters
Taiga or tundra, e.g., 5 letters
Tropical rain forest or desert, 5 letters
Tropical rain forest, e.g., 5 letters
Tundra or coral reef, e.g., 5 letters
Tundra or rain forest, 5 letters
Ecological communities, 6 letters
Ecological complexes, 6 letters
Rain forests and grasslands, e.g., 6 letters
Some complex communities, 6 letters
Carbon dioxide measurer, 8 letters
Carbon-dioxide monitor, 8 letters
Device that measures emanations of carbon dioxide, 8 letters
Like the most secure passports nowadays, 9 letters
*Design and production of materials modeled on human processes, 10 letters