- Tissue. Many cells made up a single tissue.
- Organ. Many tissues constitute an organ. For example, groups of cardiac tissue constitute the heart.
- Organ system. Group of organs made up an organ system. For example, brain and spinal cord made up the nervous system.
- Organism. Different organ system constitute an organism. Respiratory system, nervous system, digestive system, excretory system, etc. constitute an organism.
- Population. Groups of organisms made up a population. For example, if 1 billion people live in the US, then these people constitutes the population of the nation.
- Community. Populations constitute a community. For example, a population constituting many players of different sports constitutes the sport community.
- Ecosystem. Many communities made an ecosystem.
- Biosphere. Finally, all ecosystems made up the biosphere.
Hope you could get an idea from here.
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