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where does each chromosome come from?

how many chromosomes do humans have?

cells go through a series of changes including growith and division called the

what is the stage called where the cell divides into two identical cells?

what is it called when the cells have not yet become specialised?

adult stem cells are found in some organs and ?

what it it called when a cloned embryo of the patient may be made and used as a source of stem cells?

where are stem cells found in plants?