Why are conifers often called evergreens? Why do deciduous trees lose their leaves? Why do ferns turn brown? Why do outdoor ferns turn brown? Why do leaves change color in the fall? How are conifers and flowering plants different?
needle-leavedevergreenlifeformsthatprevailinSpruce-FirForests,wherethegrowing seasonissoshortthatitisnecessarytophotosynthesizewheneverthereisachance andthecostofproducinganentirelynewsetofleaveseachyearissimplytoogreat. Itisalsoinstrikingcontrasttothebroad-leavedevergreenhabitofthemoisttropics, wherethereisnoseason...