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.
Answer: Motivational.
Explanation: This service announcement is directed towards kids. It's trying to encourage and motivate them to conserve energy. You can also use the process of elimination to cross out "aggressive" and "angry." It's not showing any strong emotions either, so it's not emotional.
Answer: At school, students may watch educational videos that connect to a lesson.”
Explanation:
The detail that best supports the argument that screen time can be beneficial at school is that "At school, students may watch educational videos that connect to a lesson.”
Option A is not correct as it's saying about the importance of screen time at home. Option C is incorrect as it didn't discuss how screen time I'd beneficial at school. Option D is not really discussing the positive effect of screen time.
