Biologic evolution

It took a picture of Meretrix meretrix's skin many times.
It succeeded in taking a picture that solved the problem that was the
last doubt this time.
"Can only the dying shellfish discover clam's skin why?"
"Cannot shellfish's skin be discovered while lived?"
It is Meretrix lamarckii's corpse.


Meretrix meretrix's overcoat is pulled.
In addition, overcoat to understand the film is connected with the
entire shell is pulled.
The film cuts.
What remains on the surface of the shell becomes a skin and it
remains.

The film that became a skin in the shell and remained was photographed.

The doubt newly remained by this taking a picture.
How is the shell made?