Darwin's explanation of evolution is how things are increased and that are able to compete survive and reproduce. He found out evolution was the major things such as Natural Selection and Modern Understanding. Darwin’s process of finding out what Evolution really was took some years and as each year went on he found more information about how things and ancestors brought forth reproduction.
Fossil Records are when animals pass over time and there bodies rot out and there bones are left. That way people in our time can find out what things were and how they were shaped and in detail. When you go into the museum they have a dinosaur exhibit where you can actually see what the dinosaurs were like and how tall they