Final answer:
The oyster is a bivalve, which is an organism with two shells at the dorsal side and includes species like clams, mussels, and scallops. The correct answer to the question is (d) oyster.
Step-by-step explanation:
The question asks which of the following is a bivalve: a crab, shrimp, tuna, oyster, or SpongeBob. Bivalves are members of the class Bivalvia and are characterized by having two shells (or valves) that are at the dorsal side. This class includes organisms such as clams, oysters, mussels, and scallops. They can be found in both marine and freshwater habitats. Bivalves feed by filtering particles from water, and they lack a radula, which is a toothed tongue-like organ found in other mollusks. They exchange gases using a pair of ctenidia, and have a pair of nephridia for excretion and osmoregulation.
From the options provided, the oyster is the correct answer. Oysters, as bivalves, have the unique ability to secrete and deposit nacre or "mother of pearl" around foreign particles, which is a property commercially exploited to produce pearls. Therefore, the oyster is a bivalve and the correct option is (d) oyster.