In which layer of the soil profile do most biological activities occur? by Sunday | Jan 22 | Agricultural Science WAEC | 0 comments A. D-horizone B. C-horizone C. B-horizone D. A-horizone Correct Answer: Option D D. A-horizone Users Also Read These:The level of development of the soil profile is…The most predominant action in the first horizon of…In which layer of the soil profile do most…The B-Horizon of soil profile is also called the?In which layer of the soil profile does most…