Save this and read below! ⬇️ . Mollusks with double sided shells are known as bivalves (two valves). The orange hinge you see at the bottom is made up of an elastic protein and holds the two shells together, while the mollusk's strong adductor muscles keep the shells closed. . If you see this, the mollusk is very likely to be alive. An empty bivalve could still have it's hinge, but you would see an opening with no animal inside. . Did you know this? Comment your thoughts below 💙 . Please never

61 reactions · 12 comments | Trigonia Shell – Fossilised Bivalve #shell #fossils #dorset | UK Fossils | Facebook