green algae: algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water
organism: a living thing that has (or can develop) the ability to act or function independently
azygos vein: one of a system of veins that drain the thoracic and abdominal walls; arises as a continuation of the right ascending lumbar vein and terminates in the superior vena cava