It is answer B, that is what I think it is
Decomposition<span> is the </span>process<span> by which organic substances are broken down into a simpler matter. The </span>process<span> is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the biosphere. Bodies of living organisms begin to </span>decompose<span> shortly after death.</span>
High lattitudes is the answer
The Agricultural revolution