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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
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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 :{
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OpenStudy (anonymous):
no u fine :)
OpenStudy (anonymous):
hmm ok :D
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