Answer:
C. The scientist's conclusion is flawed because the number of hours of sunlight changed and, therefore, the experiment is not controlled.
Explanation:
A controlled experiment is an experiment used to test a single variable at a time. The variable that is being tested is called the independent variable, and it is directly manipulated by a scientist. The rest of the variables need to remain unchanged in order not to get wrong results like the scientist in the given scenario.
As the scientist is trying to see how gamma rays affect marigolds, only the gamma ray exposure is supposed to change throughout the experiment. The amount of water remained the same, but the number of hours of sunlight didn't. That's why we don't know what exactly affected the growth of marigolds - the sunlight or the gamma rays? And that's why the scientist's conclusion is flawed.
The answer is <span>The story of the war provided a common cultural heritage</span>
The sentence <em>The forecast said it will rain today </em>is declarative, as it is informing us that something is happening, you would use it to declare something you want to be known.
Interrogative sentence ends with a question mark.
Imperative sentence is used to order somebody to do something.
Exclamatory sentence ends with an exclamation mark.
Only things ending in -ing would ensure parallelism in this sentence
there for the answer is "thought about the book"
