what is the difference between a cell and a tissue and between a tissue and an organ?
A cell is a single unit/building block, it is the basis of all life, a tissue is a regroupement of cells with similar functions, and an organ is a regroupement of specific tissues (made up of these cells with similar functions) in order to accomplish a certain task.
A tissue is also smaller than an organ. An organ can be made up of many different types of tissue to do a certain job but a tissue can only do one type of job for example: muscular tissue (is a tissue) can squeeze (don't know what the word is) but an example for an organ is the stomach.