填空题

The raw material of the biological sciences has been subjected to ______.

【参考答案】

erosion and extinction
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A．How many weeks there are in a month.B．Which days people should work.C．How the week is divided into days.D．Which day begins the week.
A．How many weeks there are in a month.
B．Which days people should work.
C．How the week is divided into days.
D．Which day begins the week.
填空题
Name two of the animals mentioned in the passage which are dying out
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