Biologic evolution

Because Aonides paucibranchiata had been found, it did that it was washing in clear water and it left it.
The body fluid in the body has occurred when doing for 30 minutes.
Salinity in the inside of the body is less than seawater 3g/100g though it is a living thing that lives in seawater from which the display of 2g/100g appears when the liquid is measured in salinity.
It is likely not to live easily in seawater.
There is a possibility that the body floats.

ゴカイを見つけたので、水洗いをして放置した。
３０分すると体の中の体液が出てきた。
その液体を塩分測定したら2g/100gの表示が出た
海水の中で生活をする生物なのに、海水3g/100g
より体内の塩分は少ない。
海水の中で生活しにくいのではないだろうか？
体が浮いてしまう可能性がある。