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Scientists recently announced the discovery of the oldest fossil skeleton of a human ancestor. The find reveals that our forebears underwent a previously unknown stage of evolution more than a million years before Lucy, the iconic early human ancestor specimen that walked the Earth 3.2 million years ago.

The centerpiece of a treasure trove of new fossils, the skeleton---assigned to a species called Ardipithecus ramidus---belonged to a small-brained, 110-pound (50-kilogram) female nicknamed "Ardi."

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What is a mutant skeleton?

A mutant skeleton is a fictional or concept creature that combines elements of mutation and a skeleton, often portrayed as a creature with abnormal or exaggerated skeletal features. These can be found in various forms of media such as video games, movies, and literature.


Which structural joint type in not commonly found in the axial skeleton?

The synovial joint is not commonly found in the axial skeleton because it allows too much mobility for the axial skeleton where protection and support of internal organs calls for immobility. The axial skeleton consists of the bony and cartilaginous parts that support and protect the organs of the head, neck, and trunk.


Is hydrostatic skeleton a form or type of skeleton?

Yes, a hydrostatic skeleton is a type of skeleton found in certain invertebrates that uses fluid-filled compartments to provide support and structure to the body. It relies on the pressure of the enclosed fluid to maintain body shape and movement.


The appendicular skeleton includes the bones of the what?

The part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbs.


Why are diarthroses found predominantly in the limbs while synarthroses and amphiarthroses are found largely in the axial skeleton?

Diarthroses joints are movable joints. More movement is required in the limbs of the appendicular. Synarthroses joints are immovable joints and amphiarthroses are semimovable joints. Less movement is required in hte axial skeleton than in the appendicular skeleton.