Answer: D. His conclusion is flawed because he did not test the students to see if their bodies contained metal arsenic.
Explanation:
According to the given situation, student has tested seven different areas around the school to determine the presence of arsenic in the soil and also found the presence of arsenic in the school system. But has not studied the presence of arsenic in the students to support the fact that the school students are also affected by arsenic. So, conclusions based on the presence of arsenic in the soil and the system is inconclusive for the present study.
Answer:
Transparent
Explanation:
The quality of being able to be seen through is known as transparent
Notochod changes into Vertebral Column in the the vertebrates !! It can be bony or cartilagenous !!
So the answer is Vertebral Column !!