Answer:
-"Species have evolved in Darwin's sense of 'descent with modification'."
-"All species share a common ancestor: the change has been through a tree-like history."
Step-by-step explanation:
The theory of evolution is based on Darwin's idea of evolution and natural selection. He believes that we all came from a common ancestor and that we naturally evolved in order to survive in our habitats. That brings in the idea of natural selection where he states that only the species that are able to adapt and evolve to their changing environment will survive.