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option b for 2

above image for 1st

The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy first postulated in 1894 by Emil Fischer. In this analogy, the lock is the enzyme and the key is the substrate. Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme).

for 3rd

Explanation:

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blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.