The particle size is important because the more finely divided the solid is , the faster the reaction happen. A powdered solid will normally produce a faster reaction because it has greater surface area than the single lump
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If you think about a diabetic, when the blood sugar levels, also known as glucose levels, drop. The body will need Insulin to correct it so the answer will be “insulin”
" C " but I am not a 100% sure
New moon, quarter moon, full moon are what we call the lunar phases. These are consequences of the motions of the Sun, Earth and moon. Three dimensional models are useful because the face of the moon that catches the light of the Sun depending on their position at any given time could be depicted well. Circular models would be the best visuals for the lunar phases.