Final answer:
The B horizon, C horizon, and R horizon in a soil profile are each distinct layers with specific characteristics, with the B horizon being affected by the presence of plant matter.
Explanation:
The B horizon may not be readily found in a soil profile when plant matter is not present. This layer is a subsoil horizon that is not as fertile as the topsoil horizon (A horizon), but still important for deep-rooted plants to utilize water and minerals leached into it.
The C horizon in a soil profile represents the transition zone between bedrock and soil. It lacks organic material but may be saturated with groundwater that cannot move deeper due to the bedrock barrier below.
R horizon (bedrock) is always found beneath the C horizon in a soil profile, regardless of the presence of plant matter.
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