Which represents the most significant ethical issue regarding research and medical treatments using stem cells?
a.) the use of embryonic stem cell tissue
b.) the patenting of human genes
c.) the use of adult stem cell tissue
d.) the loss of genetic variation

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.