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.

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.