By GILLIAN FLACCUS, Associated Press PORTLAND, Oregon (AP) — Tiny bits of broken-down plastic smaller than a fraction of a grain of rice are turning up everywhere in oceans, from the water to the guts of fish and the poop of sea otters and giant killer whales. Yet little is known about the effects of these "microplastics" — on sea creatures or humans. "It's such a huge endeavor to know how bad it is,"