It took millions of years for coal to form. The process began when giant plants died. What happened to the plants RIGHT AFTER this? A)They turned into sedimentary rock.
B)They sank to the bottom of swamps.
C)They hardened because they lost oxygen.
D)They changed because of pressure and heat.

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.