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English colonists developed the concept of “no taxation without representation” in opposition to the:

Which constitutional amendment (ratified in December, 1865) formally abolished slavery in the United States?

The British general in charge of the campaigns of 1779-1780 that were designed to eliminate patriot resistance in North and South Carolina was 

Toussaint L’Overture was:

Researchers wanted to determine if pesticide X was effective at killing grasshoppers that typically invade cornfields. Two ten-acre cornfields located 1 mile apart were chosen. The cornfield to the west was sprayed only with water. The cornfield on the east received the same amount of water with a 10% solution of pesticide X. Grasshopper abundance was measured in the fields every week for 10 weeks.  The results were: West field – the number of grasshoppers doubled East field – the number of grasshoppers declined by 50% Which field was the control group?

Which statement is false regarding the carbon cycle?

Which of the following is an example of the bottom-up form of population regulation? 

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?