7. Chlorella and Spirulinaare usedas a food supplement by space travellers, Reason: These are unicellular algae
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Algae like Chlorella and Spirulina are used as a source of food. This is because Chlorella and Spirulina are single-celled proteins or SCP. Spirulina is used by the space astronauts as a source of food in the form of capsules when they are in space. Chlorella is known as the space algae as it releases oxygen.
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