Hello,
The chemical change that takes place is water and electrolytes are removed from the food being digest.
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The stem, I think. Hope it helps!
They are identical because they are made up of the same materials. we had one cell to begin with, and it didn't so much as clone itself, but split in half to creat 2 daughter cells. ther have the same plasma, same organelles, and most importantly, the same dna in their chromosomes so that when they grow, they grow exactly the same way.