- 搜标题
- 搜题干
- 搜选项
单项选择题
Somite formation in chicks proceeds
A．from anterior to posterior, as Hensen's node retreats
B．simultaneously along the axis
C．from posterior to anterior, as the primitive streak elongates
D．from the dorsal midline outward, into lateral plate
B．simultaneously along the axis
C．from posterior to anterior, as the primitive streak elongates
D．from the dorsal midline outward, into lateral plate
