單項(xiàng)選擇題無脊椎動物神經(jīng)系統(tǒng)的進(jìn)化趨勢是什么樣的？（）

A.梯形神經(jīng)一腹神經(jīng)索—鏈狀神經(jīng)
B.無神經(jīng)一腹神經(jīng)索—鏈神經(jīng)索一梯狀神經(jīng)
C.梯形神經(jīng)一神經(jīng)網(wǎng)一鏈狀神經(jīng)
D.無神經(jīng)—神經(jīng)網(wǎng)一梯形神經(jīng)—鏈狀神經(jīng)


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