The correct answer to this question is "it is not biased." The information about groundwater recorded by a student is valid when it is not biased. The results could be repeated, it should be obtained from a primary source and findings should be shared with others. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help
Why? Dimples are dominant meaning that if one dimple trait is in allele it will be shown even if there is a recessive trait. So DD and Dd are the answers