Habitat of an organism is its immediate surroundings. Habitat is the home of the organism where it can find food, shelter and favourable conditions for breeding. Habitat includes both living and non-living components.Plants and animals possess special characters which help them to survive in their own habitat. Biotic components include all the livings organisms in a habitat, i.e. plants, animals and microorganisms. 2  Abiotic components include all the non-living things in a habitat, i.e. air, soil, water, sunlight and temperature. 3  The favourable conditions for survival of living organisms are provided by abiotic components.
Casein in Foods. Most dairy products contain casein, but not all. Since casein is a protein, it is found in dairy products that have a higher protein content, such as milk, yogurt, kefir, cheese and ice cream. Dairy products that contain barely any protein, such as butter and cream, only have traces of casein.
Caseins have an appropriate amino acid composition that is important for growth and development of the nursing young. This high quality protein in cow milk is one of the key reasons why milk is such an important human food. Caseins are highly digestible in the intestine and are a high quality source of amino acids. Most whey proteins are relatively less digestible in the intestine, although all of them are digested to some degree.