Answer:
C. Stem Cell
Explanation:
Because a specialized tissue cell is a stem cell and cells that are already specialized cannot go back to being a stem cell.
Answer:
Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, Astatine.
Explanation:
All of these are Alkaline Metals
<span>Having things other than chlorophyll (or bacteriochlorophyll or bacteriorhodopsin) absorbing the light will decrease productivity in any ecosystem whose biotic basis is photoautotrophs.</span>
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