Which is the most likely reason that stem cell research is controversial?
Stem cell research could lead to the development of human clones.
Many people assume that all human stem cells come from embryos.
Research by using stem cells results in high-priced treatments for disease.
Information that is obtained from stem cell research is considered unreliable.

Answer

Many people assume that all human stem cells come from embryos.

Explanation:

Not all stem cells are embryonic stem cells. In fact, a lot of stem cell type procedures come from stem cells in bone marrow. The controversy behind embryonic stem cells is that they come from aborted babies, which many don't agree with.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide