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The maximum population density that a habitat can support without long-term degradation is called its ___.

Which of the following best illustrates bias in scientific investigations?

Joseph Priestley conducted a series of experiments in 1771 to understand how plants grow. He first placed an unlit candle inside a sealed bell jar and lit the wick with a converging lens.  After a few minutes, the flame went out and could not be relit, even when left in the sun for 2 days.  In his next experiment, Priestley changed just one variable in the original experiment by adding a sprig of mint into the bell jar along with the candle.  He again lit the candle using the converging lens, and the candle burned out after a few minutes.  Two days later he was able to relight the candle without lifting the jar.  What did the result demonstrate?

Which of the following would be the trait of a successful colonizer species? 

Which is an example of a density independent mechanism?

Which of the following represents an abiotic component of a forest community?

In ecosystems, energy ___ but matter ___.

Prior to the 1800s the human population was in a dynamic equilibrium, exhibiting slow growth. Which of the following was most responsible for the low rate of growth?

According to the IPAT formula, the environmental impact of the developing (poor) world is primarily due to ___, while the impact of the developed (affluent) world is mostly the result of ____.

After the grasshoppers had eaten most of the grasses, the population crashed. As the population recovered, each female grasshopper was able to produce 10 offspring that survived to adulthood.  As the population continued to grow, the number of surviving offspring produced dropped to five.  What kind of mechanism is now regulating the grasshopper population?