單項(xiàng)選擇題

無(wú)脊椎動(dòng)物神經(jīng)系統(tǒng)的進(jìn)化趨勢(shì)是:()

A、無(wú)神經(jīng)-神經(jīng)索-梯狀神經(jīng)索-鏈狀狀神經(jīng)索
B、梯狀神經(jīng)索-腹神經(jīng)索-鏈狀神經(jīng)
C、無(wú)神經(jīng)-神經(jīng)網(wǎng)-梯狀神經(jīng)-鏈狀神經(jīng)
D、梯形神經(jīng)-神經(jīng)網(wǎng)-鏈狀神經(jīng)

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