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artcher [175]
2 years ago
6

The boundaries of eras are marked by great worldwide changes in _____.

History
2 answers:
juin [17]2 years ago
8 0

The answer is: Life.

The eras are used to determine the order of the history of the earth. These divisions <u>are determined by the great changes that have taken place in the geology, geography, climate and other features in the life in the earth</u>. These changes are accompanied by the evolution of life or the lack of it.

Drupady [299]2 years ago
6 0
<span>The boundaries of eras are marked by great worldwide changes in </span>Life. What this means is that the way life forms work or exist changes drastically.
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