The oldest part of the bivalve shell is the ______ .
A、umbo(壳顶)
B、periostracum(壳皮层)
C、hingeligament(合页韧带)
D、leftvalve
E、rightvalve
发布时间:2024-09-06 21:10:43
A、umbo(壳顶)
B、periostracum(壳皮层)
C、hingeligament(合页韧带)
D、leftvalve
E、rightvalve