Biologic evolution

The photograph is a Meretrix meretrix while breeding.
It is a place that starts entering sand.

It thinks from how for shellfishes to die.
It is thought that the oxygen deprivation is a cause in how for the shellfish to die.
The place in which it dies is in sand.
On sand.
They are two patterns.
When the air stone before was used and bred, a lot of patterns to die on sand were seen.

It is thought that new sand became hypoxia getting on up the pattern to die in sand.
I think that this how to die is a lot of patterns in the natural world with.
Water overflows in the river because of the typhoon, the sluice is pierced, and the
thing that sand flows from the opening river is pierced for the natural world with new
sand.