In the 1920s and 1930s the so-called modern synthesis connected natural selection and population genetics , based on Mendelian inheritance, into a unified theory that applied generally to any branch of biology. The modern synthesis explained patterns observed across species in populations, through fossil transitions in palaeontology, and complex cellular mechanisms in developmental biology .   The publication of the structure of DNA by James Watson and Francis Crick in 1953 demonstrated a physical mechanism for inheritance.  Molecular biology improved our understanding of the relationship between genotype and phenotype . Advancements were also made in phylogenetic systematics , mapping the transition of traits into a comparative and testable framework through the publication and use of evolutionary trees .   In 1973, evolutionary biologist Theodosius Dobzhansky penned that " nothing in biology makes sense except in the light of evolution ," because it has brought to light the relations of what first seemed disjointed facts in natural history into a coherent explanatory body of knowledge that describes and predicts many observable facts about life on this planet. 
No single part is over 20 to 30 pounds. The heaviest piece is going to be the tripod, and it is beefier than the 6 or 8 Evo (it is the CPC tripod), and like the other poster said it is maybe 30 pounds, but it provides good stability. And it is somewhat noticeably lighter if you don't use the tray. The tray is a good chunk of metal at about 4-5 lbs. Otherwise the mount and OTA are about 15 or 20 lbs each. So, the whole package put together is about 60-70 lbs but that only matters if you want to move the whole thing put together. I think I saw someone measured it at 68 lbs fully assembled, but otherwise it is three pieces of roughly 20 lbs each, and assembly and disassembly is easy enough. The mount is secured to the tripod with three screws that hand tighten that come upward into the mount from the tripod. The mount has a standard Vixen mount that just clamps onto the OTA Vixen bracket. Then plug in the hand controller, turn it on, and go. Takes about 3 minutes at most to go from disassembled to power on.