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Answer:
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organ system: skeletal system
tissue: bone marrow
organ: bones
Explanation:
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Living things have certain levels of organization such as cells, tissues, organs and organ systems.
Cells are the lowest level or organization. An aggregation of cells is called a tissue. A number of tissues come together to make an organ and an aggregation of organs that work together make a system.
The following is the correct matching of the levels of organization in an organism;
- Organ system - Skeletal System
- Tissue - Bone Marrow
- Organ - Bones
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