Food moves through your GI tract by a process called peristalsis. The large, hollow organs of your GI tract contain a layer of muscle that enables their walls to move.
Eukaryotes can be either single or multi celled. Prokaryotic cells do not have a nucleus or any membrane-bound organelles.
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Not sure if you still need the answer but its number Three, they are the decomposers in many ecosystems
C is the answer to your question<span />
Biochemical stress is another factor fire
