To inform readers about a topic using facts and details.
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4 1 2 i thins the is the answer hope i am right
Have* this is because has* is past tense and have is more appropriate since there are multiple things you are referring too (Mercury, Venus, Earth and Mars). To be honest, these planets have a molten core.
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I do not know about your chapter or story but i am guessing he's the hero ,protagonist or some kind of main character
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