【单选题】According to the last paragraph, it is vital to analyze and study ______.
A.changes in organic life
B.the ways in which cells are formed
C.processes on which organic life depends
D.the main ways in which organisms develop
【单选题】According to the last paragraph, it is vital to analyze and study ______.
A.changes in organic life
B.the ways in which cells are formed
C.processes on which organic life depends
D.the main ways in which organisms develop
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