Ernst Mayr defined a biological species as a
A. population, whose members can interbreed.
B. group of closely related organisms.
C. All of the answer choices are correct.
D. group of organisms that live in the same ecosystem, that can interbreed and produce offspring.
E. population or group of populations that can interbreed and produce fertile offspring.
E. population or group of populations that can interbreed and produce fertile offspring.
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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone, comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. The process most likely responsible for the loss of species diversity in the experimental plots was: A. mutualism. B. predation. C. competitive exclusion. D. parasitism. E. resource partitioning.
The species-area effect for island habits is greater than that for contiguous habitats because
a. colonization rates are higher and extinction rates are lower in contiguous habitats than islands b. extinction rates are higher in contiguous habitats c. all islands have low species richness d. large islands have lower species richness than contiguous habitats Chapter 53 - Population Interactions and Community Ecology Cengage Learning Testing, Powered by Cognero Page 20 e. immigration cannot be measured in contiguous habitats
Many flowers exude a sweet fluid called __________ that is prized by many pollinators. Fill in the blank(s) with the appropriate word(s)
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Figure 36.2A
Circulation in the above diagram functions primarily as a(n) ____.
A. closed circulatory system B. open circulatory system C. semi-closed circulatory system D. system of exchange using capillaries E. continuous system of vessels