A theory does <em>not </em>become a law! So, C is already out.
In science, we always want to be updating and revising our information. We don't just say 'Oh, this supports my theory. Ah ha! It's proven! No more research is needed'.
The best option here will most likely be B. =)
On average, the actual protein molecule carries percentage of the atomic number 7 by weight unit. Nitrogen molecule
A. Oysters, clams, and other shellfish are efficient filter feeders that help remove excess nitrogen from waters by incorporating it into their shells and tissue as they grow. ... Adult oysters reportedly can filter up to 50 gallons a day, while large quahogs (hard clams) can clean about 24 gallons of water a day
