Largest organisms photosynthetic unicellular and multicellular protists that are related to land plants. The thallus of the unicellular mermaid's wineglass, "Acetabularia", can grow to several inches (perhaps 0.1 to 0.2 m) in length. The fronds of the similarly unicellular, and invasive "Caulerpa taxifolia" can grow up to a foot (0.3 m) long. A member of the order Cetacea, the blue whale ("Balaenoptera musculus"), is thought to be the largest animal ever to have lived. The maximum recorded weight was 190 metric tonnes for a specimen measuring , whereas longer ones, up to , have been recorded but not weighed. The African bush
Downward to the Earth to seven Nildoror to make them help him repair flood damage. He encounters his old colleague Jeff Kurtz (an addict of Naggiar venom), who had undergone the rebirth ceremony only to be turned into something monstrous. Nevertheless, Gunderson dares to subject himself to the rebirth ceremony, which brings him a new understanding of the native creatures and new powers by which he can heal Kurtz and impart his new-found knowledge to others. Downward to the Earth Downward to the Earth is a 1970 science fiction novel by American writer Robert Silverberg. It is a tale of the quest for transcendence