An<unk>  is a non-heritable change in a function or structure of a living organism caused after birth by disease, injury, accident, deliberate modification, variation, repeated use, disuse, misuse, or other environmental influence.<unk>  traits are synonymous with<unk> s. They are not passed on to offspring through reproduction. The changes that constitute<unk> s can have many manifestations and degrees of visibility, but they all have one thing in common. They change a facet of a living organism's function or structure after birth. For example: *The muscles<unk>  by a bodybuilder through physical training and diet. *The loss of a limb due to an injury. *The miniaturization of bonsai plants through careful cultivation techniques.<unk> s can be minor and temporary like bruises, blisters, or shaving body hair. Permanent but inconspicuous or invisible ones are corrective eye surgery and organ transplant or removal. Semi-permanent but inconspicuous or invisible traits are vaccination and laser hair removal. Perms, tattoos, scars, and amputations are semi-permanent and highly visible. Applying makeup, nail polish, dying one's hair, applying henna to the skin, and tooth whitening are not examples of<unk>  traits. They change the appearance of a facet of an organism, but do not change the structure or functionality. Inheritance of<unk> s was historically proposed by renowned theorists such as Hippocrates, Aristotle, and French naturalist Jean-Baptiste Lamarck. Conversely, this hypothesis was denounced by other renowned theorists such as Charles Darwin. Today, although Lamarckism is generally discredited, there is still debate on whether some<unk> s in organisms are actually inheritable.
Acquired characteristic
Biosimilar
Human biology
Permanent makeup
Surrogacy laws by country
Heterogeneous condition
Human genetic enhancement
Learned intermediary