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and are unicellular algae, rich in prote...

______and ______are unicellular algae, rich in proteins, that are used as food supplements even by space travellers.

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Chorella (green alga), as food supplement is rich in protein and carbohydrates. It yields about 30% proteins, 15% lipinds, 30% carbohydrates and 5% ash. Spirulina (blue-green alga) is one of the richest source of protein and vitamin `B_(2)`. In long range space exploration scientist have turned to chlorella and spirulina to use them as portable oxygen generateors and food sources.
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