At an archaeological site that was an ancient swamp, the bones from 20 brontosaurus skeletons have been unearthed. The bones do not show any sign of diseases or malformation. it is thought that these animals wandered into a deep area of the swamp abd became trapped in the swamp bottom. the 20 left femur bones were located and 4 of these left femurs are to be randomly selected without replacement for the DNA testing to determine gender
