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There are many interesting parts in a goldfish. There are lots of fins in the gold fish. The anal fin is the fin just before the tail, and the tail is called the caudal fin too. Another one is the dorsal fin which is the single fin on top of the back, the pectoral fin which is the first forward pair of wings, and the pelvic fins which are the second ventral pair of wings. The top of the head is called the cranial. The scale is the skin of the goldfish. The fish has eyes, mouth, and nostrils also.

Goldfish live in environments which oxygen is in relatively found than us. The density of water makes it difficult for us to move fluid back in forth in the respiratory organs like we do with our lungs. That is why goldfish and other aquatic animals have special adaptations to solve these types of problems. Gills are the respiratory organ of most aquatic animals that breathe water to obtain oxygen, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged. Instead of pumping water into and out, the animals pump water in one opening out to another making something like a stream in the organ but the animals don't use their energy to make it stop flowing then starting it on the opposite direction. Then, to make more gasses between the blood and water, it has an exchange system that exchanges gas.

There are many interesting parts in a goldfish. There are lots of fins in the gold fish. The anal fin is the fin just before the tail, and the tail is called the caudal fin too. Another one is the dorsal fin which is the single fin on top of the back, the pectoral fin which is the first forward pair of wings, and the pelvic fins which are the second ventral pair of wings. The top of the head is called the cranial. The scale is the skin of the goldfish. The fish has eyes, mouth, and nostrils also.

Goldfish live in environments which oxygen is in relatively found than us. The density of water makes it difficult for us to move fluid back in forth in the respiratory organs like we do with our lungs. That is why goldfish and other aquatic animals have special adaptations to solve these types of problems. Gills are the respiratory organ of most aquatic animals that breathe water to obtain oxygen, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged. Instead of pumping water into and out, the animals pump water in one opening out to another making something like a stream in the organ but the animals don't use their energy to make it stop flowing then starting it on the opposite direction. Then, to make more gasses between the blood and water, it has an exchange system that exchanges gas.

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