Earth formed about years ago, and the oldest known living organisms date to years ago.
a. 4.6 billion years ago 3.5 billion years agob. 6,000 years ago 6,000 years agoc. 13.7 billion years ago 4.6 billion years agod. 3.9 million years ago 2.0 billion years ago

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.