WebSymmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria.External symmetry can be easily seen by just looking at an organism. For example, take the face of a human being which has a plane of symmetry down its centre, or a pine cone with a clear symmetrical spiral pattern.

WebThe relationship between biology and sexual orientation is a subject of research. ... Prenatal thyroid theory of same-sex attraction/gender dysphoria has been based on clinical and developmental observations of youngsters presenting to child psychiatry clinics in Istanbul/Turkey. The report of 12 cases with same-sex attraction/gender dysphoria ...

WebEvolutionary biology is the subfield of biology that studies the evolutionary processes (natural selection, common descent, speciation) that produced the diversity of life on Earth.Simply, it is also defined as the study of the history of life forms on Earth. Evolution is based on the theory that all species are related and they gradually change over time.

WebOntogeny (also ontogenesis) is the origination and development of an organism (both physical and psychological, e.g., moral development), usually from the time of fertilization of the egg to adult. The term can also be used to refer to the study of the entirety of an organism's lifespan. Ontogeny is the developmental history of an organism within its …

WebReproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parent" or parents.Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction.There are two forms of reproduction: asexual and sexual. In asexual …

WebEssentialism is the view that objects have a set of attributes that are necessary to their identity. In early Western thought, Plato's idealism held that all things have such an "essence"—an "idea" or "form".In Categories, Aristotle similarly proposed that all objects have a substance that, as George Lakoff put it, "make the thing what it is, and without …

WebQuantum biology is the study of applications of quantum mechanics and theoretical chemistry to aspects of biology that cannot be accurately described by the classical laws of physics. An understanding of fundamental quantum interactions is important because they determine the properties of the next level of organization in biological systems.

WebUn libro electrónico, [1] libro digital o ciberlibro, conocido en inglés como e-book o eBook, es la publicación electrónica o digital de un libro.Es importante diferenciar el libro electrónico o digital de uno de los dispositivos más popularizados para su lectura: el lector de libros electrónicos, o e-reader, en su versión inglesa.. Aunque a veces se define como "una …

WebA testicle or testis (plural testes) is the male reproductive gland or gonad in all bilaterians, including humans.It is homologous to the female ovary.The functions of the testes are to produce both sperm and androgens, primarily testosterone.Testosterone release is controlled by the anterior pituitary luteinizing hormone, whereas sperm production is …

WebIn biology, a colony is composed of two or more conspecific individuals living in close association with, or connected to, one another. This association is usually for mutual benefit such as stronger defense or the ability to attack bigger prey. Colonies can form in various shapes and ways depending on the organism involved.