Question

Can someone plz help me???


Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They will conduct two investigations—one that tests the worms’ responses to different water temperatures and one that tests the worms’ responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations.

Answer 1

Do you think either student’s method would give more accurate results? Why or why not? Explain your response.

Answer 2

Thoughts?

As a major hint, in scientific experiments you only want to change one variable at a time. So in this case, the only variable that should be different between the two groups should be the temperature in the temperature investigation, and the acidity in the acidity investigation.

With all that in mind which student do you think has the better approach?

Answer 3

Both Student 1 and Student 2 have valid points, and ultimately it will depend on the specific goals and parameters of the experiment. Here are some factors to consider:

Using different groups of flatworms for each investigation may help control for any individual differences or variations between the groups of worms. This can help ensure that any differences in response between the groups are due to the specific factors being tested (temperature or acidity), rather than due to individual differences between the groups of worms.

On the other hand, using the same group of flatworms for both investigations can help reduce the total number of worms needed for the experiment. This can be more ethical and cost-effective, and can also help ensure that any differences in response between the investigations are due to the specific factors being tested (temperature or acidity), rather than due to individual differences between the groups of worms.

Ultimately, the decision on whether to use the same group of worms or different groups for each investigation will depend on the specific goals and constraints of the experiment, as well as any ethical considerations. It may be helpful for the students to consult with their teacher or a scientific advisor to help make this decision.