The evolution of insect wing patterns is best explained by
A. a new gene mutation.
B. the modification of an existing gene for a new function.
C. homoplastic convergence.
D. gene duplication and divergence.
E. conserved genes.
C. homoplastic convergence.
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The oxygen in Earths atmosphere:
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. all of these e. none of these
What is the difference between a primary and a secondary source?
A) A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. B) A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. C) A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D) There is no difference between primary and secondary sources.
Animals that possess homologous structures probably _____.
A) are headed for extinction B) have a common ancestor C) have increased genetic diversity D) by chance had similar mutations in the past E) are not related
Broad-spectrum drugs that disrupt the body's normal flora often cause
A. nephrotoxicity. B. superinfections. C. drug toxicity. D. allergic reactions. E. All of these choices are correct.