Three living species x, y, and z share a common ancestor t, as do extinct species u and v. a grouping that consists of species t, x, y, and z (but not u or v) makes up

a. a monophyletic taxon.

b. an ingroup, with species u as the outgroup.

c. a paraphyletic group.

d. a polyphyletic group

C. a paraphyletic group.

Explanation:

When referring to phylogeny a group can be considered paraphyletic when it includes the common ancestor, but it does not include all the descendants from this common ancestor.

The group is (T, X, Y, and Z), the other group is (U and V) and they both share a common ancestor (T).

The use of paraphyletic group is still controversial. Some accepted and other don't.

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.