Researchers are associating these exposures with neurological, developmental, and reproductive changes. There are also many agencies and programs for parents of children with developmental disabilities. Parents with inadequate understanding of developmental milestones may also demonstrate problematic parenting. Victimisation rates are similar to those with developmental disabilities. There are also models as theoretical perspectives from personality, social, clinical, health and developmental psychology. Medaka and zebrafish are used as research models for studies in genetics and developmental biology. People with developmental coordination disorder may be dysgraphic. The evolution of environmental models in developmental research. Genotypes along with environmental and developmental factors determine what the phenotypes will be. Essentialism has emerged as an important concept in psychology, particularly developmental psychology. Circadian rhythms are also subject to developmental plasticity. Colonial movement is determined by individual siphonophores of all developmental stages. Dyslexia is divided into developmental and acquired forms. There are also different symptoms at different ages based on developmental milestones. They focus on environmental, education and developmental rights.