Environment is the sum of substances & forces external to the organism in such a way that it affects the organism’s existence. In relation to man, the environment constitutes of air, land, water, flora and fauna because these regulate the man’s life. Environment is a multi-dimensional systems of complex interrelationships in a continuing state of
Environment is sum total of all the biotic and abiotic factors that actually affect an individual organism at any point in its life-cyckle. Human environment may be categorized as follows: 1. Natural Environment: Usual environment 2. Man-made Environment: Own environment made of his habitations, agricultural lands, industries, etc. 3. Social Environment: Part of the environment
Mixture of compounds having from one to ten chlorine atoms attached to a biphenyl ring structure. PCBs resist biological and heat degradation. Polychlorinated biphenyls (PCBs) are now banned due to adverse environmental effects and ubiquitious occurrence. They further bioaccumulate in organisms and can cause skin disorders, liver dysfunction, reproductive disorders and tumor formation.