Answers

2016-02-08T15:55:25+08:00
Valve refers to a shell, so a bivalve possesses two shells, which are usually hinged together and more or less cover the animal (Class Bivalvia), while univalves have only one shell, and typically leave the muscular foot exposed, unless the animal is capable of withdrawing into its shell (Class Gastropoda).
1 2 1
nice ... nhanp q na ang sagot.. tnx po