Youngest to oldest would be: 3, 4, 1, 5, 2. Since it's from the bottom, the ones furthest from the bottom would be the youngest at the top. The oldest fossils would be closest to the bottom.
The Embryonic stem cells are capable of limited differentiation.
Enzymes split the DNA molecule into two rails and then transport corrisponding nitrogen bases to each rail.
1. Populations changing over generations
2. Gradual change
3. Speciation
4. Natural selection
5. Common descent