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Answer:
here are three basic categories for fire alarm panel signals: trouble, supervisory, and alarm. Trouble Signal. A trouble signal is typically designated by a yellow light and means that there is an operational issue. For some more advanced systems, the panel may indicate the kind of problem and where it is located.
Explanation:
Letter B. is the answer
<span>B. Cell differentiation - start from a single cell and as the cells divide they become specialized</span>
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Answer: TRUE! 100%
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Explanation: