ANIMAL REPRODUCTION AND DEVELOPMENT
SEXUAL REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is a controlled experiment?
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Bob Williams aimed the Hubble telescope at the darkest part of the sky and discovered the Hubble Deep Field, an area rich with very distant galaxies.
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Alexander Fleming observed bacteria wasn’t growing near a species of mold that led to the discovery of penicillin.
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Charles Darwin studied finches beak shape from one island and compared them to the finches on the next island that led to the theory of evolution.
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An Australian team collected fragments of coral from the Great Barrier Reef. They split the fragments into three groups, putting each group in water with a different pH. After eight weeks, the researchers checked each fragment to see how much it had bleached.
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Explanation:
Detailed explanation-1: -A controlled experiment is a scientific test done under controlled conditions, meaning that just one (or a few) factors are changed at a time, while all others are kept constant.
Detailed explanation-2: -Answer. Answer: A controlled experiment is simply an experiment in which all factors are held constant except for one: the independent variable.
Detailed explanation-3: -Repeated trials are where you measure the same thing multiple times to make your data more reliable. This is necessary because in the real world, data tends to vary and nothing is perfect. The more trials you take, the closer your average will get to the true value.
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