valepenafrie valepenafrie

08-08-2016
Geography

contestada

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

Respuesta :

oopsydaisy oopsydaisy

13-08-2016

Out of the choices given, the boundary of eras marked by a great worldwide changes in life forms. The correct answer is B.

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narcisomtz123 narcisomtz123

02-04-2020

Answer:

life forms

Explanation:

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