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A scientist studying the effects of gamma rays on marigolds gathered the data shown below.

Hypothesis: Marigolds exposed to higher levels of radiation will not grow as well as marigolds that are exposed to less radiation

Plant A: Gamma Rays (Rad/day) is 5. Water (mL/week) 50. Sunlight (hours/day) 0. Height (cm) 4.

Plant B: Gamma Rays (Rad/day) is 10. Water (mL/week) 50. Sunlight (hours/day) 2. Height (cm) 7.

Plant C: Gamma Rays (Rad/day) is 15. Water (mL/week) 50. Sunlight (hours/day) 5. Height (cm) 10.

The scientist came to the conclusion that the hypothesis was incorrect. Why is the scientist's conclusion flawed?

A. The scientist's conclusion is flawed because the height of the plants changed and, therefore, the experiment is not controlled.
B. The scientist's conclusion is flawed because the amount of gamma rays changed and, therefore, the experiment is not controlled.
C. The scientist's conclusion is flawed because the number of hours of sunlight changed and, therefore, the experiment is not controlled.
D. The scientist's conclusion is flawed because the amount of water was not changed and, therefore, the experiment is not controlled.

Is the answer D?

Is it c??

not very helpful but is the answer C?

No, the answer is not D. The correct answer is A. The scientist's conclusion is flawed because the height of the plants changed, indicating that other factors may have influenced the growth of the marigolds apart from the gamma ray exposure. In a controlled experiment, all variables except the one being tested (in this case, the gamma ray exposure) should be kept constant. However, in this case, the amount of water and sunlight also varied, which could have affected the growth of the plants. To draw a reliable conclusion, the scientist should have controlled these variables by keeping them constant for all the plants and only changing the levels of gamma ray exposure.

No. Don't you see that you are changing BOTH the hours of sunlight AND amount of radiation. Therefore, the height grown could be due to hours of sunlight OR to radiation dose.