Integration:- The act of combining or adding parts that are related to each other to make a unified whole or Integration is the act of bringing together smaller components into a single system that functions as one. Integrated nature of EVS:- EVS in elementary education is visualized as an integrated subject area that draws upon insights from sciences (physical, chemical, and biological), social studies (history, geography, civics, etc), and environmental education (protection and conservation).Interrelated themes of EVS at the primary levelFamily and friendsFoodShelterWaterTravel Things we make and doHere it can be easily noticed that themes are interrelated as food, water and shelter are related to human and human families as they are basic needs of humans. Travel and Things we make and do show the activities of humans which are again interrelated.Hence the themes of EVS at the primary level are connected and interrelated because of the integrated nature of EVS.Additional InformationTopic-based natureThis denotes that there are various topics in EVS and the teaching progresses topics-wise which are arranged in a specific order.Disciplinary natureEnvironmental studies are multi-disciplinary because it comprises various branches of studies like chemistry, physics, medical science, life science, agriculture, and public health. It is the science of physical phenomena in the environment. Environmental studies deal with every issue that affects an organism.Single-subject natureThe environment is not a single subject. It is an integration of several subjects that include both. Science and Social Studies, so it doesn't possess single subject nature.