What kinds of evolutionary trends are represented by each of the two diagrams? The x-axis represents an ar-bitrary scale for a trait value, in this case nest diameter in a lineage of birds
a. A = active trend c. B = active trend
b. A and B = active trend d. A and B = passive trend
C
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Which of the following animals is a genetic male?
A. bird ZW B. grasshopper XO C. honeybee diploid D. Drosophila XXY
In experiments done with chimpanzees, which of the following is a limit to what chimpanzees are able to understand?
A. metaphors B. grammar C. constructing sentences D. an extensive vocabulary
You add a weak acid solution to a sample of foraminifera shells, and they bubble and fizz. This tells you that the external shells of foraminiferans are composed of:
a. silica. b. protein. c. cellulose. d. calcium carbonate. e. starch.
How do superantigens enable pathogens to hide from the immune system if they actually stimulate the immune system?
A) They cause fever, which destroys the complement proteins. B) They cause the immune system to destroy IgA antibodies. C) They cause the immune system to turn on itself. D) They cause the immune system to produce an exaggerated response, distracting it from the actual pathogen.