A paleontologist discovered a new species of fossil from 444 million years ago she calls an "inside-out, legless, headless ...

The researchers also studied fossils of extinct fishes dating back almost 400 million years and saw evidence that some of the oldest jawed fishes had bones with joint cavities for articulated ...

In place of oxygen, the ocean was full of hydrogen sulfide, which the researchers believe may have caused the organism to ...

Skeletal muscles are voluntary muscles that can be consciously controlled, such as the muscles of your limbs, head, neck, and body. They are attached to bones and respond to neuromuscular signals from ...

Muscle is a soft tissue composed of elongated cells (muscle fibres) that produce force and motion through contraction. Involuntary cardiac and smooth muscles are responsible for contraction of the ...