The correct answer is D.) Atom ,
Everything in the universe is made of atoms , and matter is too.
Anything that takes up space is usually considered matter.
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I really hope this helps you a lot.
Answer:
The Myelin Sheath allows neurons to speed up the transmission of nerve impulses.
The answer to your question is either drawbridge or scaffolding. I want to go with drawbridge because it has support and stands of for itself, so its similar to a stucture if that makes sense.
The answer is C are limited to life in a single year