If antibiotics seem effective against a human illness, then this illness is probably caused by a/an:

A bacterium that is pathogenic:

One of the most complete fossil of Australopithecus afarensis ever found was named _____________.

The _____________ theory explains how the relationship between primitive eukarytic and prokaryotic cells and how they lived off of one another.

The evolution of land organisms was not possible until enough ________ had been made by the early forms of aquatic life.

Habitat isolation is a type of PRE-ZYGOTIC barrier to reproduction.

What two mechanisms cause genetic diversity in populations?

Compare prokaryotic and eukaryotic cells. What structures do they have in common? What structure(s) are unique to prokaryotic cells? What structure(s) are unique to eukaryotic cells?

Match the features of the phylogeny shown below (labels A-E) to their correct term. Phylogeny.png

Thirty species of snapping shrimp in the genus Alpheus live off the Isthmus of Panama, the land bridge that connects North and South America. Morphological and genetic data group these shrimps into 15 pairs of species, with the members of each pair being each other’s closest relative. In each case, one member of the pair lives on the Atlantic side of the isthmus, while the other lives on the Pacific side.  Shrimp Panama.jpg What type of speciation likely led to this distribution of species? Did the land bridge predate the snapping shrimp living in this region or did the shrimp predate the land bridge?