C. All cells arise form previously existing cells. This is because the scraped knee's cells would be replaced by the exact same ones that were removed. Kind of like "Out with the old and in with the new... yet the exact same..!"
Hope this helps!
Answer: B boiling point
Explanation: To determine the mixture what given component is separated out from the mixture by its boiling point.
Answer:
B
Explanation
They have to realease things somehow
(of an immature or stem cell) capable of giving rise to several different cell types.
