If the exchange of one phone in a word for another gives a new word with a different meaning, then the two phones belong to different phonemes. The difference in meaning between the English words kill and kiss is a result of the exchange of the phoneme /l/ for the phoneme /s/ . Two words that differ in meaning through a contrast of a single phoneme form a minimal pair. Within linguistics there are differing views as to exactly what phonemes are and how a given language should be analyzed in phonemic (or phonematic) terms.
Also known as epigenetic clock, DNA clock, Horvath's clock or DNA methylation age, this biological aging clock is an age predictor that can be used to measure the age of most human tissues, cell types, or organs.orvath hypothesized that DNA methylation age measures the cumulative effect of an epigenetic maintenance system but details are unknown. The fact that DNA methylation age of blood predicts all-cause mortality in later life suggests that it relates to a process that causes aging.
The Cenozoic Era is the current geological era, covering the period from 66 million years ago to the present day. The Cenozoic is also known as the Age of Mammals, because of the large mammals that dominate it. The continents also moved into their current positions during this era.