Astudent runs a simulation of resource consumption in which cereal is used to model a resource. the student spends 15 seconds using a fork and an index card to pick up pieces of cereal and transfer them to a cup. the student runs the simulation two times, keeping all factors the same except the amount of cereal that cant be picked up at one time. what variable is the student most likely testing? a. harvesting time b. population size c. rate of harvesting d. evenness of distribution

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.