Twelve-year-old Dahlia has always lived at Silverton Manor-having spent fifty years as its resident ghost. When Oliver Day and his family show up as house-sitters the day Mrs. Tibbs, a Liberator sent by the Spectral Investigative Council, arrives to teach Dahlia the proper rules for ghosting, Dahlia can't wait to make new friends. But the unscrupulous ghost hunter, Rank Wiley, and the crooked town councilman, Jock Rutabartle, plan to rid Silverton Manor of its ghosts and sell it to the highest bidder. With her home and friendships at stake Dahlia may have to break the rules of ghosting as quickly as she learns them to solve the mystery of her death and save the manor. Equal parts charming and eerie, this ghostly caper hits all the right notes for the middle-grade audience.
Neo-Darwinism currently occupies a dominant position in evolutionary thought. While this theory has considerable explanatory power, it is widely recognized as being incomplete in that it lacks a component dealing with individual development, or ontogeny. This is particularly conspicuous in relation to attempts to explain the evolutionary origin of the 35 or so animal body plans, and of the developmental trajectories that generate them. This book examines both the origin of body plans in particular and the evolution of animal development in general. In doing so, it ranges widely, covering topics as diverse as comparative developmental genetics, selection theory and Vendian/Cambrian fossils. Particular emphasis is placed on gene duplication, changes in spatio-temporal gene-expression patterns, internal selection, coevolution of interacting genes, and coadaptation. The book will be of particular interest to students and researchers in evolutionary biology, genetics, paleontology and developmental biology.
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