Shellfish give the deceptive appearance of enjoying a peaceful existence, although in fact life is a constant struggle for them.

The bird flew upward and dropped the shellfish onto the rock to （）it open. A: cut B: press C: break D: shake

Which of the following methods of increasing annual fish harvest would have an immediate negative effect on the local marine environment? A: harvesting new species B: increasing the shellfish harvest C: fish farming D: decreasing by catch E: fish ranching

The diagram shows fish kills that have been linked to toxic algal blooms. Based on the lettered fish kills, which of the following is FALSE regarding toxic algal blooms? A: Toxic algal blooms are problematic becasue they often contaminate the drinking water supplies of large cities nearby (location B). B: Toxic algal blooms are found near river deltas that contain agricultural runoff emptying into the sea (location B) C: Toxic algal blooms release toxins that can accumulate in the shellfish and have killed southern sea otters near D: Toxic algal blooms tend to have negative economic impacts on fisheries at B and E: When toxic algae die, the oxygen demand increases due to decomposition. This leads to loss of dissolved oxygen in the coastal areas like