Making the world better, one answer at a time. Rich soil is made up of sand, silt, clay and organic matter (compost) in various stages of decomposition. Humus is the stable remains of decayed organic matter, carbon remains of unknown sorts that attach themselves to clay to improve soil structure. Humus has the ability to increase the soil's water retention, buffer PH , and helps the plant use nutrients although humus is not fertilizer but humic acids and humins.
Diseases carried by rats include, but are not limited too, the following: Bubonic plague â Rats are the primary source of plague infection in human populations. This horrific disease is spread to humans from rats by fleas. It's present in rodents throughout the western United States, and in many other parts of the world (see map).
, Just your average under-performing ethology student. Wild rats can pose a decent danger to humans, as they can act as vectors for diseases both directly by transmitting bacteria that cause 'Rat Bite Fever' (among other diseases by contact or injury) and indirectly by playing host to disease-carrying parasites. That said, thanks to modern medicine, they aren't too big of a threat.