In which layer of the soil profile do most biological activities occur? By: Sunday|Published on: Jan 22|Categories: 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 B-Horizon of soil profile is also called the?In which of the soil layer does most biological…A soil profile refers to the?The most predominant action in the first horizon of…In which layer of the soil profile do most…SEE ALSO Â Which of the following gives the correct order of usage of tillage implements on a virgin land?