They say how an enzyme perfectly fits into its substrate is alike a "lock and key".
Only one specific enzyme can fit a specific substrate.
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The function of the appendix is unknown. One theory is that the appendix acts as a storehouse for good bacteria, “rebooting” the digestive system after diarrheal illnesses. Other experts believe the appendix is just a useless remnant from our evolutionary past.
Answer:
Hydro is the most renewable power resource with global hydroelectric installed capacity exceeding 1,295GW accounting 18% of the world's total installed power generation capacity and more than 54% global power generation capacity
