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Which of the following is most likely the reason for this change in

Earth Science

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Which of the following is most likely the reason for this change in...

 

Which of the following is most likely the reason for this change in pine pollen abundance?

1) the pine forests were heavily logged off  

2) a warming climate dramatically increased angiosperm forests

3) a return to colder conditions led to an expansion of the pine forests

4) as rivers drained the land, angiosperms began to replace pine forests