YUSUFU KANDITA
Feb 16
What are evidences to show that amphibians descendent from lobe-ray fishes?
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Feb 16
There are several lines of evidence that support the idea that amphibians descended from lobe-finned fishes:
1. Fossil evidence: Fossils of early amphibians, such as Ichthyostega and Acanthostega, show a combination of fish-like and amphibian-like characteristics. These fossils have limb-like structures with digits, suggesting a transition from fins to limbs.
2. Comparative anatomy: The anatomy of lobe-finned fishes, such as the coelacanth and lungfish, shares several similarities with amphibians. Both groups have similar bone structures in their fins, suggesting a common ancestor.
3. Genetic evidence: Genetic studies have shown that amphibians, lobe-finned fishes, and lungfish share common genetic sequences, indicating a close evolutionary relationship. These genetic similarities provide further evidence for a shared ancestry.
4. Developmental similarities: The embryonic development of lobe-finned fishes and amphibians also shows similarities. Both groups undergo similar stages of development, including the formation of gill arches and the transformation of fins into limbs.
5. Transitional fossils: Fossils of transitional forms, such as Tiktaalik, provide strong evidence for the transition from fish to amphibian. Tiktaalik has fish-like features such as scales and fins, but also possesses limb-like structures with wrists and elbows.
Overall, the combination of fossil evidence, comparative anatomy, genetic studies, developmental similarities, and transitional fossils all support the idea that amphibians descended from lobe-finned fishes.
1. Fossil evidence: Fossils of early amphibians, such as Ichthyostega and Acanthostega, show a combination of fish-like and amphibian-like characteristics. These fossils have limb-like structures with digits, suggesting a transition from fins to limbs.
2. Comparative anatomy: The anatomy of lobe-finned fishes, such as the coelacanth and lungfish, shares several similarities with amphibians. Both groups have similar bone structures in their fins, suggesting a common ancestor.
3. Genetic evidence: Genetic studies have shown that amphibians, lobe-finned fishes, and lungfish share common genetic sequences, indicating a close evolutionary relationship. These genetic similarities provide further evidence for a shared ancestry.
4. Developmental similarities: The embryonic development of lobe-finned fishes and amphibians also shows similarities. Both groups undergo similar stages of development, including the formation of gill arches and the transformation of fins into limbs.
5. Transitional fossils: Fossils of transitional forms, such as Tiktaalik, provide strong evidence for the transition from fish to amphibian. Tiktaalik has fish-like features such as scales and fins, but also possesses limb-like structures with wrists and elbows.
Overall, the combination of fossil evidence, comparative anatomy, genetic studies, developmental similarities, and transitional fossils all support the idea that amphibians descended from lobe-finned fishes.
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