Why do we need friction

since friction is resistance force that slows down or prevents motion it is necessary in many applications where you might want to hold items or do things and prevent slipping or sliding if there was no friction you would not be able to walk,drive a car ,or hold objects.

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Explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

food source and hunting?