fish

Fish are the gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms.
Aquarium - colorful jigsaw puzzle
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Aquarium

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Aquarium - colorful jigsaw puzzle
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Aquarium

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Vietnam. Coral reef.

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CORAL REEF

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CORAL REEF

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CORAL REEF - coral reef, underwater life, colorful fish
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CORAL REEF

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CORAL REEF - coral reef, marine fauna, ocean,
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CORAL REEF

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CHILDREN WITH WORTH - SUMMER FISHING FOR THE RIVER
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CHILDREN WITH WORTH

Added 3 months ago by TED

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something to eat

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Colorful fish

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Colorful fish - colorful aquarium puzzle
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Colorful fish

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Sharks 3

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Sharks 2 - shark sharks
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Sharks 2

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shark tiger

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Aquarium - colorful fish in the aquarium
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Aquarium

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Life of the ocean

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Fighter

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pokemon poplio

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Siamese fighter

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Axolotl

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Colorful trees

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pets and animals

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Underwater world - colorful puzzle jigsaw
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Underwater world

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Fishing - colorful fish puzzle
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Fishing

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Aquarium - colorful aquarium fish
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Aquarium

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Underwater world - colorful puzzle with fishes
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Underwater world

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Underwater world - colorful puzzle jigsaw
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Underwater world

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Aquarium - colorful puzzle jigsaw
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Aquarium

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Underwater life - colorful puzzle jigsaw
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Underwater life

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