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What skeletal adaptations allowed fishes to evolve into four-legged walkers and land dwellers?
Responses
Reactions or actions in answer to a stimulus or situation.
Posttraumatic Stress Disorder
A mental health condition triggered by experiencing or witnessing a terrifying event, characterized by flashbacks, nightmares, and severe anxiety.
Recurrent
Occurring repeatedly or periodically.
Intrusive Thoughts
Unwanted, involuntary thoughts, images, or ideas that can be distressing or disturbing.
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