tl;dr Higher activation energy required to activate slip-systems Ductile and brittle are relative terms, since the deformation of a material and the corresponding mode of failure depends on many conditions in addition to crystal structure such a...
Skin cells live about two or three weeks. Colon cells have it rough: They die off after about four days. Sperm cells have a life span of only about three days, while brain cells typically last an entire lifetime (neurons in the cerebral cortex, for example, are not replaced when they die).
Source(s): average life span red blood cell anucleate condition affect life span: https://biturl.im/mO4hz. red blood cell lives on average 120 days. It does not contain a nucleus or any other cellular organells for that matter, and it derives its own energy without using the oxygen it is carrying to the tissues.