Many insects, fish, and mammals release certain chemical messengers to signal reproductive readiness. What are these messengers
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So its just easy now to match the layer labelled in the given sample with the standard that I attached.
Therefore B would be the White Blood cells and these are responsible for the defense of the body from the invasion of foreign objects. Thus Option 4
Therefore B would be the White Blood cells and these are responsible for the defense of the body from the invasion of foreign objects. Thus Option 4