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The amazing Biosphere Egg is a self-sustaining mini ecosystem that survives on light alone. Each biosphere egg contains a ecologically balanced mix of plant life, algae and animals. The best thing about a biosphere is that you never need to change the water or even feed the creatures. All it needs to survive is a daily input of light, preferably around six hours Light triggers photosynthesis in the algae, which produces the oxygen the freshwater shrimp within the biosphere need to survive. Its height is 13cm, diameter 10cm.
