A young patient presents with a small invagination of the skin on the anterolateral neck, just below the jaw. The CT scan of this patient indicates a cervical (pharyngeal) cyst connected to it. What term describes the invagination?

A. Ectopic thymus
B. External Branchial Fistula
C. Internal Branchial Fistula
D. Pharyngeal Cleft
E. Pharyngeal Pouch


Answer: B. External Branchial Fistula

Biology & Microbiology

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Characters that provide evidence for evolutionary relationships based on shared ancestry are called ____

a. homologous b. analogous c. taxonomic d. convergent e. exaptations

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By using fossil evidence, paleontologists have concluded that most species exist from years before becoming extinct.

A. 100 to 1,000 B. 1 million to 10 million C. 10,000 to 100,000 D. 1,000 to 10,000 E. 100,000 to 1 million

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The most recent level of evolution in primates is considered to be in

a. brain expansion. b. behavior and culture. c. dentition. d. hand grip. e. daytime vision.

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