A researcher has been studying lichens in his hometown. Since he began his study, he has noticed several lichens dying in the vicinity of a new factory. What is most likely causing the decrease in lichen populations?
A. the diversion of water sources to the
factory (i.e., lichens are drying out)
B. an increase in air temperature, the result of
CO2 emissions from the factory
C. the blocking of sun by the factory (i.e., the
lichens aren't getting enough sunlight)
D. an increase in industrial pollutants in the
area
D
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At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction? Select all that apply.
_____ Glaciation. _____ Volcanic eruptions. _____ Meteorite collisions with Earth. _____ Competition between marine and terrestrial species. _____ Sudden drop in atmospheric O2.
Answer the question using the accompanying figure. In the diagram of a root tip, the structure labeled "5" is the ____
a. quiescent center b. zone of cell division c. zone of elongation d. root cap e. zone of maturation
How does the evidence for the theory of common descent demonstrate consilience?
A) scientific evidence is refuted by other scientists B) new evidence can be added to the theory of common descent C) observations driven from different sources agree on the findings. D) new evidence cannot be added to the theory of common descent
As the size of a population approaches the carrying capacity
A. the number of births and deaths are about equal. B. the population is in the lag phase. C. density-dependent limiting factors are not important. D. the biomass decreases.