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.
The A and E horizons are silt loam, gravelly silt loam, or very gravelly silt loam. The BA or BE horizon has hue of 7.5YR or 10YR, value of 5 and chroma of 4 or 6 or hue of 5YR or 2.5YR, value of 4 or 5 and chroma of 4 or 6. It is silt loam or silty clay loam, or their gravelly, very gravelly, or extremely gravelly analogs. The Bt horizon has hue of 2.5YR or 5YR, value of 4, and chroma of 6 or with value of 5, and chroma of 6 or 8, or hue of 2.5YR, value of 3, and chroma of 6 or value or 4 or 5 and chroma of 6 or 8 or hue of 7.5YR, value of 5 and chroma of 6 or 8 with mottles in shades of red and brown.