What ecological process causes a lake to change into a marsh over a long period of time?
A) Extinction
B) Coevolution
C) Eutrophication
D) Competitive exclusion
E) Succession
E
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Patients with Creutzfeldt-Jacob disease live ________ post diagnosis.
A. 10 to 20 years B. greater than 25 years C. 5 to 10 years D. less than 1 year E. 1 to 5 years
Figure 19.4
The spark discharge in the accompanying figure represents ____.
A. sunlight energy in the environment. B. heat energy in the environment. C. electrical energy in the environment. D. ionizing radiation in the environment. E. the explosion of the hydrogen gas to release energy for the reactions.
Th17 cells are important in the first stages of the adaptive immune response
Indicate whether the statement is true or false.
Which of the following is not involved in the regulation of the cell cycle?
A) cyclins B) internal and external signals C) growth factors D) check points E) caspases