Mitochondria should be the answer
Animals have so many different enzymes to digest their food they eat variety of food in their diet so specif enzymes are needed to digest each type of food
No doubt, the United States is a powerful country in the world today. It has made its mark in the history by building a strong economy that every other nation envies, and idolizes as well. But, all that glitters is not gold. And every country has its pluses and minuses. There are some serious social issues in the United States as well that need to be dealt with to maintain the position of power and prestige, and set a true example of ideal society in the world.
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