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alga singular form of "algae."
algae organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are algae. "Algae" is a plural noun; the singular form is "alga."
lichen a living thing that is a fungus and a form of algae or special bacteria living together. The algae or the bacteria use photosynthesis to make food for the fungus. There are many kinds of lichens with different colors, such as green, gray, black, or red. They can look like scales, crusts, or branches. Lichens live on rocks and other places where there is no soil.
sloth a mammal that spends its entire life in trees, using its long claws to hang upside down. Sloths live in the tropical rain forests of Central and South America. They move very slowly, and their long fur turns green from algae growing in it. Sloths are related to armadillos and anteaters. [1/2 definitions]