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What Is the Name of the Mesoderm-Derived, Calcium-Stiffened Structures That

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What is the name of the mesoderm-derived, calcium-stiffened structures that comprise the internal skeleton of echinoderms?


Definitions:

Autonomic Nervous System

The part of the nervous system that controls involuntary bodily functions, like heart rate, digestion, and respiration, divided into the sympathetic and parasympathetic nervous systems.

Anxiety Disorders

A category of mental health disorders characterized by significant feelings of anxiety and fear, interfering with daily activities.

Identical Twins

Identical twins are siblings who develop from a single fertilized egg that splits into two, sharing 100% of their DNA and typically having very similar physical characteristics and, often, similar behaviors.

Post-Traumatic Stress Disorder

A mental health condition triggered by experiencing or witnessing a terrifying event, leading to persistent flashbacks, nightmares, and severe anxiety.

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