circulatory system, nervous system, and the digestive system
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Explanation:
Paranoia, flat affect, and anhedonia are negative symptoms of schizophrenia
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Science plays a rather large role in the modern world. Without it, devices such as phones, computers, and even TV wouldn't exist. With advances in science, humans have been able to cure many ailments and diseases that were previously incurable.
I'm almost positive that this is DNA. LMK if I'm correct.