Biological definition of adult

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Please refresh the page and retry. A dulthood does not begin until 24, scientists have concluded because young people are continuing their education for longer and delaying marriage and parenthood. The traditional definition for adolescence is currently between and the ages of 10 and 19, which marked the beginnings of puberty and the perceived end of biological growth.

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Developmental biology is the study of the process by which animals and plants grow and develop. Developmental biology also encompasses the biology of regenerationasexual reproductionmetamorphosisand the growth and differentiation of stem cells in the adult organism. In the late 20th century, the discipline largely transformed into evolutionary developmental biology.

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When asked how old you are, you likely answer based on the number of years that have passed since you were born. That would be your chronological age. But maybe your doctor says you have the physical conditioning of a year-old.

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Background Low birthweight has been consistently shown to be associated with coronary heart disease CHD and its biological risk factors. The effects of low birthweight are increased by slow infant growth and rapid weight gain in childhood. To quantify the importance of developmental processes in the genesis of CHD it is necessary to establish the impact of fetal, infant and childhood growth on major pathological events in later life—death, hospital treatment and the need for medication.

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The choice of a phenotype is critical for the study of a complex genetically regulated process, such as aging. To date, most of the twin and family studies have focused on broad survival measures, primarily age at death or exceptional longevity. The aim of this review is twofold: first, to summarize growing consensus on reliable methods of biological age assessment, and second, to demonstrate validity of this phenotype for research in the genetics of aging in humans.

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Biologicallyan adult is a human or other organism that has reached sexual maturity. In human context, the term adult additionally has meanings associated with social and legal concepts. In contrast to a " minor ", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficientand responsible.

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From an evolutionary gene's-eye perspective, the genes are immortal, and our role, the meaning of life, is to perpetuate the genes. In a few centuries, all traces of our existence as human individuals -- memories of us, all our accomplishments --will likely be gone and forgotten, except for genes that survive from those of us who successfully reproduced through the generations. But, of course, we don't experience the world from a gene's eye evolutionary perspective.

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As individuals move through early and middle adulthood, a variety of physical changes take place in the body. As we age, our bodies change in physical ways. One can expect a variety of changes to take place through the early- and middle-adult years.

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I was of the mind that reproductive potential was a fairly accurate benchmark, but some people argued that simply marks the beginning of adolescence and that adulthood occurs much later. Is there a right answer as far as biology is concerned? Legally, socially, societally, I know that it varies by country and state, but I wondered if adolescence was considered a kind of early adult state. I am also of the mind that adolescence is a relatively new biological and social concept.

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