Yes. "in the far distant future" I'm not certain about the use of "leftovers". Also, "they and their leftovers" (plural) doesn't agree with "fossil" (singular).
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avid learnerin far distant futurein the far distant future
avid learnerleftoversThe meaning of this is unclear. You should explain it.
GPY"they and their leftovers" (plural) doesn't agree with "fossil" (singular).Fossil is singular because if I am mistaken "another" cannot be paired with a plural noun.
avid learnerSo, another fossils would be wrong.Yes, "another fossils" would be wrong, but that does not make the agreement right. You could say, for example:
GPYThey and their artefacts will just be more fossils from Earth’s past.Thanks.