Biology: Evolution and Classification

The most recent common ancestor of modern birds probably lived about ______ million years ago?

Morphological features include ______ size, wing length, and adult body weight.

Monophyletic groups are any group of organisms that includes the most recent common ancestor of that group and all of its past and present ______.

A ______ group is a group of organisms derived from more than one common evolutionary ancestor or ancestral group and not suitable for being in same taxonomy.

Mammals and birds were once classified as each other’s closest living vertebrate relatives, based on ______.

Wallace’s Line separates fauna in two distinct faunal groups: ______ and Indomalayan.

The first fossil bird discovered was ______.

Powder down feathers are characterized by ______ at the tips.

The stiff, tapered feather around a bird's head is called a ______ feather.

The tiny hooklets that attach adjacent pennaceous feather branches are called ______.

The loss of genetic variation that occurs when a new population is established by a very small number of individuals is called a ______ event.

The points on a phylogeny where branches separate, usually representing points where an ancestral lineage splits into two or more descendant lineages, are called ______.