As part of an experiment to measure decomposition rates of different materials, students put food scraps from the cafeteria in compost bin A, and leaves and grass clippings in compost bin B for six weeks. Students in first period measured the temperature in bin A, and students in sixth period measured the temperature in bin B. What is the greatest error in the students experimental design? a) There are too many uncontrolled variables in the experiment
b) Temperature is the only dependent variable in the experiment
c) The materials chosen decompose too rapidly
d) The students put equal masses of materials in each bin.