An organelle is a cellular structure which performs specific functions within a cell. Organelles are important to the cell as cells would not be able to function without them: even the most common organelle - the nucleus. A cell without a nucleus cannot function (except prokaryotes, as they have an undefined nucleus)
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it is accepted that cells contain DNA in chromosomes and RNA in the nucleus and cytoplasm, but only in the modern cell theory. the classical cell theory does not include this. but using either classical or modern theory, it is false that all cells have DNA surrounded by a nucleus.
Explanation:
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Possibly a dichotomous key to classify the different types of weather?