Seafood refers to edible aquatic animals, excluding mammals, but including both freshwater and ocean creatures. Most nontoxic aquatic species are exploited for food by humans. Even those with toxic properties, such as certain blowfish, can be prepared in a way that circumvents harm to the consumer.Fish and other seafood may be humanity’s most important food after cereals, furnishing about 15 percent of the world’s population’s protein intake. Lean fish muscle provides 18–25 percent protein by weight, which is equivalent to beef or poultry but much lower in calories. In fish, one gram of protein is present for 4 to 10 calories, whereas lean meats contain 10–20 calories per protein gram, and fatty meats can have up to 30 calories per gram of protein.Seafood comprises all bony fishes and the more primitive sharks, skates, rays, sawfish, sturgeons, and lampreys. It also includes crustaceans such as lobsters, crabs, shrimps, prawns, and crayfish, as well as mollusks like clams, oysters, cockles, mussels, periwinkles, whelks, snails, abalones, scallops, and limpets. Additionally, cephalopod mollusks—squids, octopuses, and cuttlefish—along with edible jellyfish, sea turtles, frogs, and echinoderms like sea urchins and sea cucumbers, are considered seafood.The most commercially important ocean fish include species of salmon, herring, codfish, flatfish (flounder, sole, halibut, turbot), redfish (ocean perch), jack mackerel, tuna, mackerel, and sardine. Major freshwater species consist of carp, eel, trout, whitefish, pike, pike perch, and catfish. The catch varies greatly in size, from whitebait and baby eels, both about 5 cm (2 inches) long, to bluefin tuna, which can reach up to 4.3 meters (14 feet) in length.Because fish spoils quickly and is highly perishable, for most of history, the majority of the catch has been dried, smoked, salted, pickled, or fermented when not eaten fresh. Even when these preservation methods are no longer strictly necessary, the distinct flavors they produce have cultivated a continued demand for fish prepared in these ways. Fish can be cooked whole or cut into steaks, fillets, or chunks. Crustaceans are usually cooked whole and alive, as are most mollusks. Larger and tougher mollusks are ground or sliced and pounded to tenderize their firm flesh. Some seafood is eaten uncooked, either completely raw or modified slightly by marination.The range of fish cookery worldwide is immense. Fish can be poached, sautéed, broiled, baked, deep-fried, steamed, or eaten raw. Seafood, often combined with other ingredients, serves as the foundation for many savory stews, soups, chowders, gumbos, and bisques. In general, more delicate and leaner seafoods are paired with milder seasonings and sauces, while those with stronger flavors or fattier flesh are complemented by more pronounced seasonings.(Adapted from https://www.britannica.com/topic/seafood)Which of the following best captures the central focus of the passage …