The circulatory system is the only way by which an animal can supply oxygen and nutrients to its cells,or remove waste materials from the cells.

Name: The circulatory system is the only way by which an animal can supply oxygen and nutrients to its cells,or remove waste materials from the cells.
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The circulatory system is a primary method for transporting oxygen, nutrients, and waste, but other systems like the respiratory and lymphatic systems also play roles in these processes.

The Circulatory System Is the Only Way by Which an Animal