https://youtu.be/urSNtaQKOAk 1835. The Galapagos Islands. Young English naturalist Charles Darwin collects animal and plant specimens for study. His observations on these islands will be fundamental in formulating his theories which many years later will be published in his great work On the Origin of Species, a revolutionary book that change the way biology was understood, giving rise to new scientific theories. In this book Darwin lay down the scientific principle that each species had not always been the way we know it today. Rather, each one had changed and altered over time. Three concepts are important for understanding Charles Darwin's theories - natural selection, evolution and the origin of species. In animals and plants, random trait mutations and modifications can appear. For example, a moth that is born a different…