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More than 25,000 species of algae live in aquatic environments or in some regions with damp soil; they vary in height from 0.01 mm to several meters.

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Brown-pigmented alga that usually lives in the sea, often in cold water; there are more than 1,500 species of brown alga.

Alga often found in freshwater, but also in seas and some nonaquatic environments; there are 6,000 species of green algae.

Red-pigmented alga that generally lives in salt water and at greater depths than other algae; there are 4,000 species of red algae.

Small, occasionally branched disk, located at the base of certain thalli, enabling their attachment to a substrate.

Part of the thallus that is shaped like a blade; it is quite wide and looks like a leaf.