Some species employ both mitosis and meiosis, whereas other species use only mitosis because they need both if they are producing animal gametes.
Sex cells divides through meiosis and non sex cell divide through mitosis in animals while in plants sex cell divide through both mitosis and meiosis.
In human and all other animals species , the non sex cells such as skin cell, muscles cells , blood cells etc. divided by mitosis. It is so because these cells deplete at a fast rate and hence their retrieval also needs to be fast. Sex cells like male and female gametes are haploid cells an hence their divide through meiosis. In plants gamete formation requires both mitosis and meiosis cell division.
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