Answer:B. The variety of species in an ecosystem
Explanation:
In a dominant cross, the chance of the dominant phenotype showing up in one of the offspring is 3/4, since the dominant genes are being shown here.
First, you need to do the multiplacation that's inside the perenthises.
Second, you will need to divide the two answers which will give you that first box.
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.