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are tail-like projections found only in eukaryotic cells (that is, the cells of animals). There are two types: motile (that is, mobile) and non-motile. The two functions of these types of projections are to either move through the cell or to act as sensory organisms. Along with flagella, these projections are part of a group of organelles (that is, cell parts) known as undulipodia

2  the villi play a role in digestion, they also are essential for the absorption of digested nutrients. The cells of the villi and another part of the small intestine, known as the crypts, transport food from the digestive tract into the bloodstream, where they can be used by the body. The villi aid in absorption by increasing the surface area of the intestine and contain specialized cells which transport different types of nutrients into the blood.
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Cilia: this is very small hair like projection help in displacement in some prokaryotes or eukaryotes.
Villi:present in the intestine help in increase in surface area of the intestine.These are small finger like projection
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