In a natural community in Colorado, producer organisms might include * a. Bacteria, fungi and viruses
b. Deer, rabbits and mice
c. Bears, aspen and flies
O d. Grasses, spruce trees and pinon pine

A. radioactive dating

This movement is also referred to as  glacial plucking

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil. 

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.