Plants use various hormones and enzymes to respond to changes in day length (photoperiod) and to trigger events such as dormancy and flowering. How will these molecules respond in plants living in locations with shorter daylight hours?

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures