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.
Over time, different sized particles within the parent material are redistributed and they separate into layers called horizons. These horizons can be seen in the soil profile, a vertical section of a soil visible when a pit is dug three to six feet deep. The topsoil, rich in organic matter, is called the A horizon. Leaching is the loss of materials from the A horizon when water carries clay and soluble matter downward.