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It means a condition resulting from an unbalanced diet or insufficient food
You cannot put any sort of endmark (period, question mark, or exclamation point) here because it is not a complete sentence. Complete sentences must have a subject and a predicate. You can tell there's not even a verb here, so this is just a fragment, and we would have to use a comma.
a. Very truly yours,
Answer:
Some viruses are doctors' inventions.
Newer drugs inventions by the doctors, has really contributed positively on the global economic growth.
They can write a list of what they can to improve the environment with everyone else, and maybe have a discussion about how they can participate in the class activity of tree planting.