Biologic evolution

It is corbicula's macro photography.
It is glad to have taken the water pipe beautifully.

It kept observing the corbicula, and a point different only by the littleneck
clam, Hamagri, the Tsb shellfish, the mussel, etc. and one was found.
It is ". "
The littleneck clam etc. are looking at Unco like the string from one water
pipe many times among two water pipes.
It is being written that the picture book is completely excreted from the
water pipe.
Excluding the water tank all day long at the time of not seen excrement like
the string come out from the water pipe though it is a corbicula
Cannot you easily see the corbicula while the littleneck clam etc. can easily
see the excretion from the water pipe?
It might been excreted by another, and when diving in sand, it is likely to
excrete from the water pipe.