In the blood clotting process, platelets arrive at the site of damage and start secreting substances to attract more platelets. More platelets arrive at the site and secrete attractants to recruit more platelets. This is an example of

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This is an example of positive feedback because the process involves an initial trigger (platelets arriving at the site of damage) that leads to an amplified response (more platelets being attracted to the site), enhancing the direction of the change.

In the Blood Clotting Process, Platelets Arrive at the Site