I think it might be C
could i get brainlyest if it's right
A dinosaur egg is a fossil. So is petrified wood.
'So' is a conjunction that depicts comparison between subjects in a sentence in this case. The use of 'so' in this sentence is incorrect because when comparing two subjects, which in this case are dinosaur egg and petrified wood, they should be in one sentence idea. When using the punctuation mark period '.' it ends the idea of the sentence in the first sentence given.
Yellowstone was supposed to erupt around 2,000 years ago from what i know, which makes it loooong overdue.