Harm can be defined as causing physical or psychological/emotional damage or injury to a person, animal or other entity. Psychology (ancient Greek: psyche = soul and logos = word) is the study of mind, thought, and behaviour. ... Injury is damage or harm caused to the structure or function of the body caused by an outside agent or force, which may be physical or chemical. ... In colloquial English, person is often synonymous with human. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria Acoelomorpha Orthonectida Rhombozoa Myxozoa Superphylum Deuterostomia    Chordata (vertebrates, etc. ... An entity is something that has a distinct, separate existence, though it need not be a material existence. ...

It is generally believed that humans, in addition to other sentient animal species, possess an innate aversion to harm. Human beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. ... Sentience is the capacity for basic consciousness -- the ability to feel or perceive, not necessarily including the faculty of self-awareness. ...

Most people (albeit not everybody) tend to view harm as the 'barometer' of determining whether an action should be considered morality or immoral. Morality is a complex of principles based on cultural, religious, and philosophical concepts and beliefs, by which an individual determines whether his or her actions are right or wrong. ...