Which of the species concepts are you using when you use a field guide to identify a bird?
A. phylogenetic species concept
B. biological species concept
C. ecological species concept
D. morphospecies concept
Ans: D. morphospecies concept
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Can pollinator shifts enhance rates of species formation in plants?
A. yes B. no
Answer the following statements true (T) or false (F)
1. In a commensal relationship between a phoretic species and its "host", the phoretic species is not affected. 2. Humans exert top-down pressures on white-tail deer. 3. Resource partitioning enables species that are better competitors to exclude similar species from a community. 4. Secondary metabolites originally meant to defend a plant can become essential compounds for some herbivores.
Java man and Peking man are both examples of Homo ________.
Fill in the blank(s) with the appropriate word(s).
Given the average outcomes for the treated and control groups, and their respective sample standard deviations, how does the number of observations impact the spread of a confidence interval?
A. Only increasing the number of treated will increase the spread of the confidence interval B. Only increasing the number of treated will decrease the spread of the confidence interval C. Only increasing the number of control groups will decrease the spread of the confidence interval D. None of the answers is correct.