â¢ The response of the innate system is rapid while that of the adaptive immunity is slow (Over 1-2 weeks). â¢ The innate system has limited and lower potency. In contrast, the adaptive system has high potency. â¢ The innate system recognizes a broad range of pathogens, but it cannot make fine distinctions.
As plant roots do not reach this layer, the C horizon is typically devoid of organic matter. R Horizon (Bedrock) The R horizon is basically the deepest soil horizon in the soil profile. Unlike the horizon above, this horizon does not comprise rocks or boulders, but instead is made of continuous mass of bedrock. It is very difficult to dig through this layer.
Designations (lower case) that may be applied to them. For cases in which a layer of soil has charactersistics of more than one Master Soil Horizon, the rules for assigning transitional horizons are provided in a section at the end. O horizons or layers: Surface layers of organic material accumulated on top of the surface of either mineral or organic soil. O horizons may consist of undecomposed or partially decomposed litter,