Which of these describes variation within a species or population? A population is defined as members of the same species living together in the same area and who are likely to breed with each other.

Evergreen trees have needle-like leaves

Rex rabbits can have one of 16 different colors of fur

Fish use gills to obtain oxygen from water

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.