Large crystals indicate that it cooled very quickly. If it cooled slowly, it would have time to settle down and make a nice smooth rock.
Your answer would be D, Photosynthesis
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The mixture would be :
1. Homogeneous; dissolving followed by filtration and distillation
salt dissolve in water and will be the filtrate and chalk will be the residue in the filter paper
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It continues to multiply untill the max. later it eats itself to make more space for it to multiply
