Autotrophs take in food from the outside world and convert them into stored forms of energy. This material is taken in the form of carbon dioxide and water which is converted into carbohydrates in the presence of sunlight and chlorophyll.
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In second case, the particles settle down which were suspended throughout the bulk and the path became not visible.
Asked: In: Class 9 Science
Milk is a colloid with small particles of butterfat suspended through the liquid.