Examlex
A concrete obstruction built out into the water from a beach to inhibit sediment removal by littoral drifting is called a(n) _____.
Circulatory System
The body's system responsible for transporting blood, nutrients, gases, and wastes to and from cells.
Spicules
Small, pointed structures made of calcium carbonate or silica found in sponges and some other invertebrates, serving as structural support and defense.
Tracheal Tubes
A system of small tubes in insects that carries oxygen directly to tissues and organs.
Exoskeleton
A rigid external covering that supports and protects the bodies of certain animals, such as insects, crustaceans, and some mollusks.
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