Question

1. \an organism that is closely related to the group youre interested in, but not a part of it. a way to establish a basis of comparison for an trait analysis.\ this is a definition of:

a. an ancestor
b. a marker
c. an outgroup
d. a stem group

Explanation:

In cladistics, an outgroup is a group of organisms that is closely related to the ingroup (the group of interest) but not part of it. It is used as a basis for comparison in trait analysis. An ancestor is a direct forebear, a marker can refer to various things like a genetic marker but not in this context, and a stem group is a paraphyletic group.

Answer:

C. An outgroup