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:2024-11-05 06:40:26
A、umbo(壳顶)
B、periostracum(壳皮层)
C、hingeligament(合页韧带)
D、leftvalve
E、rightvalve