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Answer:
External Anatomy
Common external anatomical features of fish include: External is the outside such as dorsal fin, mouth, and eye
internal Fish Anatomy is the inside of the fish which includes spine, brain, kidney and gills
Internal structure of fish includes spine, spinal cord, brain, lateral line, gills, kidney, etc. Its external structure includes dorsal fin, caudal fin, pectoral fins, ventral fins, gills, lateral line, nares, mouth, scales, and body shape are all features to look out for.
What is a fish?
A limbless cold-blooded vertebrate animal with gills and fins living wholly in water is renowned as a fish.
Internal structure of fish includes spine, spinal cord, brain, lateral line, gills, kidney, etc. It can be seen in the image attached.
Its external structure includes dorsal fin, caudal fin, pectoral fins, ventral fins, gills, lateral line, nares, mouth, scales, and body shape are all features to look out for.
Thus, these are the internal as well as external structure of fish.
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