Thr answer is c sorry if am wrong
Classification is subject to change because science is an evolving subject. New things are discovered every year and thus changing the way we understand the world around us.
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Plants and animals could not live without nitrogen<span>. It is an </span>important<span> part of many cells and processes such as amino acids, proteins, and even our DNA. It is also needed to make chlorophyll in plants, which plants use in photosynthesis to make their food and energy. hope this helps!</span>