Only the strongest survive. explain how this relates to darwin's theory of natural selection and the survival of the fittest. i need !

Which of the following statements describes how the characteristics of different species of mammals reflect the evolutionary relationships among those species? shared anatomy among mammals, such as hair and mammary glands, suggests that a common ancestral species had these features. similarities in the dna and protein structures of mammal species suggest that these species evolved from a common ancestor. although all modern species of mammals share some features, the differences between them mean they cannot share a common ancestor.

In a cladogram' when does a group of organisms branch off

Cells destroy body cells infected by a virus or bacteria.