A Dolphin's So-Called Grin Is Not a True Facial Expression

question 641

True/False

A dolphin's so-called grin is not a true facial expression, but just the bony curvature of its mouth.

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Definitions:

Sore Muscles

A common physical condition characterized by pain, stiffness, or discomfort in muscles, often after intense exercise or unusual physical activity.

Chest Pain

A symptom of numerous potential conditions, ranging from non-serious muscle strain to life-threatening cardiac issues.

Body Movements

Physical actions or motions carried out by the muscles that result in a change of position or posture of the body or its parts.

Costochondritis

Inflammation of the cartilage that connects a rib to the breastbone, causing chest pain that can mimic that of a heart attack.