Question

this diagram shows a food chain from chesapeake bay, an estuary ecosystem in maryland and virginia. the arrows show how the matter eaten by organisms moves through the food chain. select each organism below that is both a predator and prey in this food chain. phytoplankton common grass shrimp atlantic silverside bluefish pelican

Explanation:

In a food chain, an organism that is both a predator and prey is one that eats another organism (predator role) and is also eaten by another organism (prey role).

• Common grass shrimp: Eats phytoplankton (predator) and is eaten by Atlantic silverside (prey).
• Atlantic silverside: Eats common grass shrimp (predator) and is eaten by bluefish (prey).
• Bluefish: Eats Atlantic silverside (predator) and is eaten by pelican (prey).

Phytoplankton is only a producer (eaten by common grass shrimp, no predator role here as per the given food - chain). Pelican is at the top of this food - chain (no prey role as it is not eaten by any other organism in this chain).

Answer:

common grass shrimp, Atlantic silverside, bluefish