Which organism will most likely produce soil first А
Mosses and Lichens
B
Shrubs and small trees
с
Grasses
D
Hardwood trees

I believe the answer is A. Mosses and lichens because bacteria and fungi cause soil formation.

The rate that would change would be the  searching efficiency/attack rate. there are only two other rates in this model: the  growth rate of prey, and the  predator or consumer mortality rate.the  searching efficiency/attack rate is what indicates how effectively can a predator capture its prey whether in the searching process or actual capturing/attacking process. 

Yes yes yes very good