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OpenStudy (anonymous):

The boundaries of eras are marked by great worldwide changes in? A) earth’s crust B) life forms C) climate D) continental coastline

OpenStudy (anonymous):

what would you choose??

OpenStudy (anonymous):

idk

OpenStudy (anonymous):

well I would choose A . I'm not 100% sure but i think its Earth crust

OpenStudy (anonymous):

mm it wasn't correct….idk why

OpenStudy (anonymous):

ops sorry :{

OpenStudy (anonymous):

no u fine :)

OpenStudy (anonymous):

hmm ok :D

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