Below is the result of a study conducted by Hughes et al. What was the primary purpose of this study?
a. to examine how many times eusociality evolved independently in the hymenoptera
b. to study the evolution of polyandry in the hymenoptera
c. to test whether eusociality can be maintained in polyandric species
d. to infer whether monandry was the ancestral state in separate origins of eusociality
D
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When a wolf or dog bows, this signal tells the receiver that the behavior that follows is ________
a. aggressive b. submissive c. sexual d. playful
Which of the following types of cells would a flu virus most likely target as the means of entry into the body?
A. epithelial cells lining the respiratory system B. epithelial cells on the skin's surface C. red blood cells that are exposed through breaks in the skin D. osteoclasts within bone cells
The amount of accumulated organic matter found in an area at a given time is the ________ crop biomass
Fill in the blank(s) with correct word
What condition best describes the endogeneity problem?
A. The variance of the errors (Ui) depends on Xi. B. One of the Xi variables is correlated with the error term (Ui). C. Some variables within Xi are perfectly correlated with other variables in Xi. D. The distribution of the errors (Ui) is non-normal.