According to a study, published in the journal Nature Communications, Amazon rainforest could shift to a savannah-type ecosystem within ________ years.

According to a study, published in the journal Nature Communications,

1.	According to a study, published in the journal Nature Communications, Amazon rainforest could shift to a savannah-type ecosystem within ________ years.
A.	10
B.	15
C.	25
D.	50
E.	70
Answer» E. 70