What is the single most important factor that makes worldwide sustainable development difficult?
What will be an ideal response?
The size of the human population is probably at a level that makes sustainability difficult, and the population continues to grow.
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B cells are more effective than macrophages in presenting antigens to activate T cells when
A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.
Although the United States only holds 4% of the world's population, what percentage of carbon dioxide emissions are produced in the United States?
Intrinsic factors, such as behavior and physiology, may affect growth rates of a population.
Answer the following statement true (T) or false (F)
Which factor has the LEAST effect on the amount of incoming light that strikes an area?
A. Latitude B. Temperature C. The tilt of Earth’s axis D. The amount of cloud cover E. Season