Examlex
Match the following:
-Carries oxygen-poor blood to the lungs.
Biological Organization
A hierarchical structure that organizes different aspects of life, from atoms to biosphere, to study life's complexity and processes in an orderly manner.
Organ Systems
Groups of organs that work together to perform complex functions in an organism.
Ecosystem
A community of living organisms and their physical environment interacting as a system.
Physical Environment
The external surroundings and conditions in which an organism lives, including both natural and man-made factors.
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