Answer:
A is the answer.
Step-by-step explanation:
Cells make up the tissues and the tissues make up the organs, once you have enough organs then it's an organ system, sorry if this is wrong but it is the most logical answer you're welcome :)
Hello There!!
The answer is A. Cells make up tissues, which make up organs, which make up organ systems.
hope this helps,have a great day!!
~Pinky~
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