What did charles darwin call the ability of an organism to survive and reproduce in its specific environment

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.

Would really appreciate it, i have an idea but not completely sure

Which short-term environmental change is most likely to lead to ground shifting, landslides, and the collapse of buildings or roads? forest fires flooding earthquakes