Sponges move huge volumes of water through their bodies every day. Although this serves the function of filter feeding for the organism, how might this also provide an “ecosystem” service (something that affects and/or benefits other organisms in their environment)? "which one below is the right answer and why?" a/ They can filter small poisonous fish out of the water that may harm other organisms. b/ Their body chambers serve as places where smaller organisms can live and be protected from certain predators. c/ They produce large numbers of gametes that will become food for other sponges. d/ They create small currents in their microenvironment that help to circulate and clean water locally for other organisms.