Trace the flow of energy through a typical food chain (describing "what eats what"), including the original source of that energy and its ultimate form after use. underline each form of energy and energy-storing molecule, and boldface each process which transfers or transforms energy.
can someone explain to me what exactly i'm supposed to do for this and give me guidelines.

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.