Answer:
DISADVANTAGES
Embryonic stem cells can have high rejection rates
Adult stem cells have a determined cell type
Obtaining any form of stem cell is a difficult process
Stem cell treatments are an unproven commodity
Stem cell research is a costly process.
ADVANTAGES
can help enhance the growth of new healthy skin tissue, enhance collagen production, stimulate hair development after incisions or loss, and help substitute scar tissue with newly developed healthy tissue.
A- Changes in the inherited characteristics pf a population over time.
C.The unique role the species plays in an ecosystem .
The correct answer is...Once the enzyme binds to the specific substrate molecule, subtle structure changes occur in the active site, which are reverted when the reaction is over.
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