Evolution. Where have all Thoreau's flowers gone?
Pennisi
Elizabeth
E
D005075:Biological Evolution; D002980:Climate; D017753:Ecosystem; D035264:Flowers / Q000254:growth & development*; D017752:Greenhouse Effect; D008404:Massachusetts; D063245:Plant Development; D012621:Seasons; D013045:Species Specificity; D013997:Time Factors