Researchers Have Found That

Researchers have found that:

A) marine organisms are unable to regulate the ionic composition of their internal fluids to counter ocean acidification and continue to build calcium carbonate skeletons.
B) some marine organisms are able to regulate the ionic composition of their internal fluids to counter ocean acidification and continue to build calcium carbonate skeletons; corals are among those that can.
C) some marine organisms are able to regulate the ionic composition of their internal fluids to counter ocean acidification and continue to build calcium carbonate skeletons; corals are among those that cannot.
D) most marine organisms, including corals, are completely unaffected by ocean acidification.
E) some coral species are able to regulate the ionic composition of their internal fluids to counter ocean acidification and continue to build calcium carbonate skeletons; others are not.