Examlex
Discuss the Ardipithecus ramidus fossil and its implications for understanding human evolution.
Water Vascular System
A unique hydraulic system used by echinoderms, such as starfish, for locomotion, food and water transportation, and respiration.
Exoskeleton
A rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
Bony Tissue
Hard tissue that makes up the skeletal bones in vertebrates, providing support, protection, and enabling mobility.
Echinodermata
A phylum of marine animals characterized by radial symmetry, a water vascular system, and typically a spiny skin.
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