問(wèn)答題如何確定腔腸動(dòng)物的進(jìn)化地位

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4.名詞解釋假體腔
5.單項(xiàng)選擇題無(wú)脊椎動(dòng)物的神經(jīng)發(fā)展為()

A.無(wú)神經(jīng)—梯神經(jīng)—索式神經(jīng)—鏈狀神經(jīng)
B.無(wú)神經(jīng)—網(wǎng)神經(jīng)—梯神經(jīng)—索式神經(jīng)—鏈狀神經(jīng)
C.無(wú)神經(jīng)—索式神經(jīng)—網(wǎng)神經(jīng)—鏈狀神經(jīng)
D.無(wú)神經(jīng)—梯神經(jīng)—鏈狀神經(jīng)