The reason why there still needs improvement in the past view of Archaeopteryx is thatA．fo

The reason why there still needs improvement in the past view of Archaeopteryx is that

A．fossils of those earliest birds haven"t been discovered yet.

B．the wishbone they studied is just so-called wishbone.

C．there was no study of the role of its brain and some faculties in flight.

D．Archaeopteryx is regarded as the earliest known bird.

请帮忙给出正确答案和分析，谢谢！

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