The living microbial biomass includes<span> the microorganisms responsible for decomposition (breakdown) of both plant residues and active </span>soil organic matter<span> or detritus. Humus is the stable fraction of the </span>soil organic matter<span> that is formed from decomposed plant and animal tissue. It is the final product of decomposition.</span>
The correct answer is B. Bolivia.
Altiplano is a Spanish word for high plain - it refers to the Bolivian Plateau, which is actually the widest part of the Andes in South America. The largest part of the plain is in Bolivia, however, it is also located in Peru, Chile, and Argentina.
