All of the following events can trigger an adaptive radiation EXCEPT _____
A) an unusual event splitting a habitat, such as a severe hurricane
B) the evolution of a new morphological feature
C) the extinction of competitors
D) Hox gene duplication events
A
You might also like to view...
Cyanobacteria
a) can fix nitrogen, thus causing many freshwater ecosystems to be limited by phosphorus availability. b) can mineralize phosphorus from wetland sediments, raising phosphorus levels in inland waters to the point of eutrophication. c) mineralize the phosphates in detergent from an organic corm into an inorganic form that can cause algal blooms and eutrophication. d) consume excess N and P in inland waters and so are essential tools for watershed restoration and management e) occur when aquatic ecosystems are disrupted by invasive species, and can cause pathogenic infections of native species, further enhancing the invasive nature of introduced exotic invaders.
Some bacteria in the deep oceans use iron as an energy source to make carbohydrates from carbon dioxide. These
bacteria would be classified as ____.
a. chemoautotrophs b. chemoheterotrophs c. photoautotrophs d. photoheterotrophs e. decomposers
Which of the following sequences of events in the production of recombinant DNA are in the correct order?
A. cut DNA with restriction enzymes, mix DNA with plasmid DNA, add DNA ligase B. mix DNA with plasmid DNA, cut with restriction enzymes, add DNA ligase C. add DNA ligase, cut DNA with restriction enzymes, mix DNA with plasmid DNA D. mix DNA with plasmid DNA, add DNA ligase, cut with restriction enzymes E. cut with restriction enzymes, add DNA ligase, mix DNA with plasmid DNA
In general, the vessels that carry blood away from the heart in a closed circulatory system are referred to as
A. auxiliary hearts. B. capillaries. C. arteries. D. sinuses. E. veins.