Several times in Earth's history, land masses have converged as supercontinents. _________and

__________ are examples. Fill in the blank(s) with the appropriate word(s).


Gondwana; Pangea

Biology & Microbiology

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Paired lungs are characteristic of ____

a. spiders b. all birds c. all fishes d. all amphibian life stages e. all insects

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Clonal selection requires the presence of foreign antigens.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Recurrent episodes of rheumatic fever would MOST likely cause:

A) metastatic brain cancer. B) frequent streptococcal infections. C) progressive failure of the liver. D) permanent damage to the heart valves.

Biology & Microbiology

The signs and symptoms of infection with Helicobacter pylori are the result of

A) damage to the lining of blood vessels by H. pylori. B) invasion by H. pylori into the mucosa of the large intestine. C) invasion by H. pylori into the mucosa of the stomach. D) the production of exotoxins by H. pylori in the intestines. E) the production of toxins by H. pylori in contaminated food.

Biology & Microbiology