The use of stem cells in research and treatment remains controversial because stem cells come from:
A)nonhuman species.
B)human embryos.
C)paid adult donors.
D)genetic engineering in the laboratory.

Question

Quizplus · Accepted Answer

Stem cells used in research and treatment often come from human embryos, which is why their use is controversial. While other sources of stem cells exist, such as from certain adult tissues, embryonic stem cells are considered to have the greatest potential for medical treatments.

The Use of Stem Cells in Research and Treatment Remains