One piece of evidence for evolution in the anatomical record is the presence of vestigial organs. Vestigial organs are organs that no longer serve a purpose for the organism. Examples in humans are the tailbone and wisdom teeth. The presence of these organs suggests that modern humans did evolve from older hominid species who used such organs. A second piece of evidence is the developmental process that occurs during gestation. As the human fetus develops, it goes through changes that seem to mirror the evolution of the species. Finally, the presence of redundant organs suggests an evolutionary history. Having two kidneys and two lungs isn't strictly necessary for survival. This redundancy suggests that evolutionary pressure works on organisms even more so than does environment.