The axolotl, an aquatic amphibian, primarily uses its ________ for gas exchange.

A. tracheal tubes
B. parabronchi
C. gills protected by an operculum
D. lungs
E. external gills


Answer: E

Biology & Microbiology

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In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment, which one of the following would you NOT expect to find in the collection flask?  

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If the age structure of a country's population is balanced, what prediction can be made about the near future?

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What is the difference between genetic dissection and genome sequencing?

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