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1 ans-A lichen, or lichenized fungus, is actually two organisms functioning as a single, stable unit. Lichens comprise a fungus living in a symbiotic relationship with an alga or cyanobacterium (or both in some instances). There are about 17,000 species of lichen worldwide.
2ans-Fluids are substances that can flow. They include liquids and gases. Since these substances can flow from one place to another they are called fluids. They don't have any fixed shape. They take the shape of the container they are poured into. Although liquids have fixed volumes gases don't have any fixed volume.
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