Cell wall is the outer permeable covering in all pants and almost all prokaryotes ! cell wall are mainly made up of cellulose , sometime by chitin!!
b,d,f,e,c,a is the order in which it goes as the scientific method
Coal seams are far deep underground to be considered for opencast minings. These coal seams require underground mining. Since it is too deep underground, it can be used for mapping and correlation of sedimentary rocks or as a key bed.
Option C
This is an example of acquired mutation in which there is genetic transformation due to external factors such a change of temperature, pollution, radiation etc.
