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Gills are a common juvenile characteristic in amphibians which are kept after maturation; examples are the tiger salamander and rough-skinned newt, both of which retain gills into adulthood. [33] Bonobos share many physical characteristics with humans, including neotenous skulls. [39]
Physical. Growth is steady though slower than in first two years. Adult height can be predicted from measurements of height at three years of age; males are approximately 53% of their adult height and females, 57%. Legs grow faster than arms. Circumference of head and chest is equal; head size is in better proportion to the body.
Human adulthood encompasses psychological adult development. Definitions of adulthood are often inconsistent and contradictory; an adolescent may be biologically an adult and display adult behavior but still be treated as a child if they are under the legal age of majority.
Because of this, typical hallmarks of adulthood like marriage, child-bearing, and home ownership were delayed. These are characteristics generally associated with "full-on" adulthood. [45] As those characteristics had yet to be reached, adults within this stage did not seem to fit the standards.
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]
A child using fingers to make a small, circular hole in the sand, 1997. Child development involves the biological, psychological and emotional changes that occur in human beings between birth and the conclusion of adolescence. It is—particularly from birth to five years— a foundation for a prosperous and sustainable society. [1]
The incidence and quality of physical activity education in early childhood education have a strong positive effect on the cognitive, social and physical development of young children. [12] Early childhood is a stage of rapid growth, development and learning and each child makes progress at different speeds and rates. [ 13 ]
The development of the human mind is complex and a debated subject, and may take place in a continuous or discontinuous fashion. [4] Continuous development, like the height of a child, is measurable and quantitative, while discontinuous development is qualitative, like hair or skin color, where those traits fall only under a few specific phenotypes. [5]