Algae are useful because they
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Phytoplankton are tiny microscopic plants - algae - that form the base of the marine food chain. The most important living things on our green planet are single cell algae. And they are the most important because they produce oxygen, more oxygen than anything else does.
Some of the uses of algae are :-
*Algae are useful to man in perform half of the total carbon dioxide-fixation on earth by photosynthesis.
*Helps as the primary producers in aquatic habitats.
* Many species of marine algae such as Sargassum, and Laminaria are edible and thus can be eaten. *Chlorella and Spirulina are used as food supplements being rich in proteins.
*Agar is used in the preparation of jellies and ice-cream.
*Many red algae such as Corallina are used in treating worm infections.