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Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads : the ovaries in a female, the testicles in a male.
Human brain. The brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous system. The brain consists of the cerebrum, the brainstem and the cerebellum. It controls most of the activities of the body, processing, integrating, and coordinating the information it receives from the sense organs ...
Down syndrome (United States) or Down's syndrome (United Kingdom and other English-speaking nations), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [ 3] It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic ...
4Kids Entertainment, Inc. (formerly known as Leisure Concepts, Inc. and later known as 4Licensing Corporation; stylized as 4K!DS ENTERTAINMENT) was an American licensing company. The company was previously also a film and television production company that produced English- dubbed Japanese anime through its subsidiary 4Kids Productions between ...
Blood is composed of blood cells suspended in blood plasma. Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume), [ 2] and contains proteins, glucose, mineral ions, and hormones. The blood cells are mainly red blood cells (erythrocytes), white blood cells (leukocytes), and (in mammals) platelets (thrombocytes). [ 3]
Of pregnancies among girls aged 15–19 girls in 2008, 59% ended in birth, 26% in abortion, and the rest in miscarriage. [17] Overall, 68 pregnancies occurred per 1,000 girls aged 15–19 in 2008. Nearly 7% of 15–19-year-old girls become pregnant each year. Pregnancies are much less common among girls younger than 15.
The authors used administrative longitudinal data on the entire population of children born between 1998 and 2007 in the Netherlands, which was the first country to legalize same-sex marriage. They followed the educational performance of 2,971 children with same-sex parents and over a million children with different-sex parents from birth.
In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million ( ppm ...