Things such as coal and oil are limited because they are only found in some places
The magnification of the ocular lens of a microscope is x10 and the magnification of the objective lens for low, medium, and high power are 4X, 10X, and 40X, respectively. The measured dFOV under medium power is 2.6mm.
Characoal has an energy more than the wood that’s why it burns hotter but if there is no sufficient air supply it will make the characoal less efficient
Certainly most of the microorganisms in nature have been successfully cultured in the laboratory. In fact there are several ways to do it using different kind of mediums that help the development of microorganisms. Also, there are various type of medium for developing various kind of cells.
