Search results
Results from the WOW.Com Content Network
Adult development encompasses the changes that occur in biological and psychological domains of human life from the end of adolescence until the end of one's life. Changes occur at the cellular level and are partially explained by biological theories of adult development and aging. [ 1 ]
One of the two sperm centrioles of fruit fly exhibit the retention of "juvenile" centriole structure, which can be described as centriolar "neoteny". This neotenic, atypical centriole is known as the Proximal Centriole-Like. Typical centrioles form via a step by step process in which a cartwheel forms, then develops to become a procentriole ...
Emerging adults "regard themselves as being neither adolescents nor adults, in between the two but not really one or the other." [2] [22] This feels like an awkward time of life as these emerging adults have control and independence, yet they may still be relying on their parent's insurance, housing, and groceries. They are able to do many ...
Ontogeny (also ontogenesis) is the origination and development of an organism (both physical and psychological, e.g., moral development [1]), 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.
The word, youth, can also mean the time between childhood and adulthood , but it can also refer to one's peak, in terms of health or the period of life known as being a young adult. [ 1 ] [ 2 ] Youth is also defined as "the appearance, freshness, vigor, spirit, etc., characteristic of one, who is young". [ 3 ]
In biological terms, human development entails growth from a one-celled zygote to an adult human being. Fertilization occurs when the sperm cell successfully enters and fuses with an egg cell . [2] The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences.
Adult moths and butterflies are easily distinguished from their caterpillars. An adult is an animal that has reached full growth. [1] The biological definition of the word means an animal reaching sexual maturity and thus capable of reproduction. In the human context, the term adult has meanings associated with social and legal concepts.
A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [ 3 ] are extinct .