What is the purpose of the oil on the oil immersion lens? a- oil provides a medium for the bacteria to float on the slide b- oil is a lubricant and allows the objectives to slide easily c- oil prevents any water from seeping into the cover slip d- oil prevents light distortion and makes the images clearer

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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.