Concrete is a composite FOURTH class construction material, composed of cement (commonly Portland cement) and other cementious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravel or crushed rocks such as limestone, or...
Moulds are organisms that are found indoors and outdoors. They are part of the natural environment and play an important role in our ecological system by breaking down and digesting organic material. Moulds are neither plants nor animals. They are Fungi. Fungi do not...
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