I believe the answer is c
The correct answer is that the shells of clams and other mollusks dissolve when the pH becomes more acidic.
This is because the shells of clams and other mollusks are made of calcium carbonate that is dissolved in acidic conditions. The pH needs to be low to dissolve calcium carbonate into it. It takes few days to dissolve the shell completely.
The cell membrane is said to be selectively permeable is because it allows a select few things to go through while stopping the passage of other stuff.
Answer:
do you know some people have golden blood
If they live in a river, they would most likely need fins (to swim) and gills (to breathe under water)
Hope this helps!
