Rapid development of dams for hydropower raises concerns about dam safety.
Answer the following statement true (T) or false (F)
True
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The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is due to a positively charged helium nucleus?
A. a B. b C. c D. all of the above E. none of the above
Air containing all of the water vapor it can hold is ________.
a. saturated b. unstable c. adiabatic d. dew point e. convective
The stages of the epidemiologic transition are based on
A) causes of death at varying stages of the demographic transition. B) the means through which disease is transmitted spatially. C) non-contagious diseases such as heart disease, obesity, or diabetes. D) new food sources which produced population explosions. E) pandemics like the bubonic plague, influenza, or AIDS.
Negative feedback processes tend to function within ecosystems to ________
A) cause further ecological destruction B) cause ecological relationships to flourish C) cause ecological relationships to disintegrate D) reinforce harmful changes E) stabilize the ecosystem