Roots and stems
Explanation: the cork of mature roots and woody stems is perforatedby nonsuberized pores called lenticels.
Sugars are molecules that have a 1:2:1 c:h:o and are called carbohydrates.
It could tell the weight of the individual that wore the footprint. It's especially useful in crime cases, because using the weight and shoe size, interpreters can accurately guess the height and gender of the individual.