Cell, the smallest unit that can exist independently
Nutrients enter a cell up the concentration gradient by the process of active transport.
Answer: Cells
Explanation:
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
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<span>The family consumed botulism toxin in the canned green beans.</span>
