Diagram 1 shows the fossilized remains of the lower portion of a camel's leg. each subsequent diagram shows the same portion of a camel's leg, but the diagrams are from progressively later time periods. diagram 4 shows the most recent fossil. these diagrams demonstrate oa. that fossils can show how a species changes over time. ob. that fossils show how species stay the same over time. oc. that modern camels have more toes than earlier species of camels. od. that all living organisms have increased in size over time.