can someone help me turn this into an if then statement for my lab??? i am really stuck and can include more info about the lab if needed. statement- i think the unknown skull looks most like Australopithecus afarensis (extinct hominid) because of how long the skull is and the skinny shape/cheekbones thanks!

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.