Pseudomyrmex ants live exclusively in the swollen thorns of acacia trees. In return for food and shelter provided by the trees, the ants aggressively defend the tree from leaf-eating insects. This interaction between ants and acacias represents an example of

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#Question id: 16797

#Section 5: Applied Ecology & Evolution

The 1918 flu pandemic, also called the Spanish Flu was caused by

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#Question id: 11928

#Section 2: Evolution

In most species, deviations from equal proportions of males and females in a sexually-reproducing population will confer an advantage to genotypes that: 

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#Question id: 4708

#Section 2: Evolution

The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?

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#Question id: 9190

#Section 2: Evolution

What is the probable role of salicylic acid in the defense responses of plants?

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#Question id: 9159

#Section 2: Evolution

Which of the following investigations would shed the most light on the future distribution of organisms in temperate regions that are faced with climate change?