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Which of these is an example of chemical coordination occurring in BOTH plants and animals?

Question
Which of these is an example of chemical coordination occurring in BOTH plants and animals?
Nervous impulses
Hormones
Muscle contraction using contractile proteins
Reflex arcs
Answer
Hormones
Detailed Explanation
The text explicitly notes that chemical coordination, via hormones, is seen in both plants and animals, unlike nervous tissue which is unique to animals.
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