Question

type your response in the box. 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. do you think either student’s method would give more accurate results? why or why not? explain your response.

Explanation:

Using the same group of worms for both investigations (Student 2's method) may introduce bias as the worms could be affected by the first - investigation when undergoing the second. Using two different groups (Student 1's method) allows for a more independent assessment of each variable (temperature and acidity). Each group can serve as a more natural control for the specific variable being tested in its respective investigation.

Answer:

Student 1's method may give more accurate results because using two different groups of flatworms for the two different investigations (temperature and acidity) can reduce the potential confounding effects of one investigation on the other. Each group can be considered a more independent sample for the specific environmental variable being tested.