What causes scientific knowledge to change over time?
o
a. scientists try new ideas to keep their work interesting.
o
b. new technology proves that earlier scientists based their
| explanations on biased views.
o
c. living systems are constantly changing, so previous explanations
may no longer apply.
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d. new data can lead to a reevaluation of earlier scientific
explanations.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

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the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.