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General inflammation of a joint cavity:

Number of thoracic vertebrae:

The epidermis is what type of epithelial tissue?

Cells responsible for the formation of the myelin sheath.

Largest of the white matter commissures, it interconnects most of the cerebral cortex:

Arrector pili are muscles best associated with:

All glands that release their products by way of ducts, rather than directly into the bloodstream, are called _____ glands.

Fly to each of the locations in the Question 16 folder. Make sure to explore the images in the area by selecting the photo icons. Which location best represents the coastal environments at 1.85 Ga based on the feature found in question #15?

The landscape in North America remains more or less unchanged at this location until the Permian period (late Paleozoic Era~300-250 Ma). Use the stratigraphic column below to help you answer the following questions. 

What likely caused this unconformity? Tip: think about what kind of rocks these are and their corresponding depositional environments.