The Native-American diplomat who greeted the Pilgrims with two arrows was?

During the Columbian Exchange, Europeans introduced to America all of the following except:

What invention made Benjamin Franklin famous? _______

The empressario known as the “Father of Texas” was:

Amendment three of the Constitution:

Amendment three of the Constitution:

The blood-brain barrier is produced and maintained by

The blood-brain barrier is produced and maintained by

The ________ provides the principal link between the nervous and endocrine systems.

Raising the potassium ion concentration in the extracellular fluid surrounding a nerve cell will have what effect?