![]() All cnidarians can regenerate, allowing them to recover from injury and to reproduce asexually. Hydras are a genus of the Cnidaria phylum. In a similar manner stem cells and gametes can be regarded as "immortal". ![]() However, if the parent asymmetrically buds off a daughter only the daughter is reset to the youthful state-the parent isn't restored and will go on to age and die. In these conditions, when a cell splits symmetrically to produce two daughter cells, the process of cell division can restore the cell to a youthful state. ![]() However, symmetrically dividing bacteria and yeast can be biologically immortal under ideal growing conditions. Asymmetrically dividing bacteria and yeast also age. Many unicellular organisms age: as time passes, they divide more slowly and ultimately die. In 2018, scientists working for Calico, a company owned by Alphabet, published a paper in the journal eLife which presents possible evidence that Heterocephalus glaber (Naked mole rat) do not face increased mortality risk due to aging.
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