According to my research on different types of studies, I can say that based on the information provided within the question lifespan develop-mentalist's are researchers and practitioners from a variety of disciplines. They also believe that no particular, single period of life governs all development.
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Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Oceanic crust is hydrothermally altered causing addition of quartz and sodium.
