An error is that the scientist did not control their variables. They had one group of people playing the game at 6, and another group playing at 12. This means that other things might have affected the scores other than what was being tested, which was caffeine.
The complete question is:
Two factors which cause global climate change are listed below.
- Factor 1: Volcanic eruptions.
- Factor 2: Changes in the amount of Sun’s heat received by the Earth’s atmosphere and surface.
Which of these statements is correct about the two factors which cause global climate change?
- Factor 1 and Factor 2 are considered natural factors.
- Factor 1 and Factor 2 are considered human induced factors.
- Factor 1 is a human induced factor and Factor 2 is a natural factor.
- Factor 1 is a natural factor and Factor 2 is a human induced factor.
<h2>Answer</h2><h2 />
- <u>The correct answer is the first choice: Factor 1 and factor 2 are considered natural factors.</u>
<h2>Explanation</h2>
The <em>causes of global climate change</em> are those <em>factors</em> that have an impact in our planet's climate. They may be either anthropogenic or natural.
Anthropogenic means generated (<em>induced</em>) by the <em>human</em> being, i.e. by the activities that we the humans perform, e.g. industry, automotive transportation, household waste, deforastation, use of fossil fuels.
<em>Natural causes</em> are product of the nature's cycles or events, such as the amount of energy that the Sun radiate, the volcanic activity, the natural cooling and warming of the air from the ocean, and glacial changes due to ice ages.
Hence the two<em> factors</em> stated in the question, <em>volcanic eruptions</em> and <em>changes in the amount of Sun’s heat received by the Earth’s atmosphere and surface are considered natural factors.</em>
