Here are the correct answers to your questions:
Question 1: A) Dehydration impacts the function of the brain and can make concentrating more difficult.
Question 2: B) environmental
Question 3: A) liver
Question 4: C) Anxiety, irregular heartbeat, muscle tremors
Question 5: D) tobacco use
Question 6: D) Try to go to bed and wake up at the same time each day.
Question 7: C) chronic disease
Question 8: D) Aerosol from e-cigarettes contains substances known to cause damage to the lungs.
Question 9: A) caffeine
Question 10: C) Endorphins
Question 11: C) Addiction
Question 12: A) personal hygiene
Question 13: D) Fruit chews and sports drinks
Question 14: A) prescription drug misuse.
Question 15: C) omega-3 fatty acids
Question 16: C) Secondhand
Question 17: D) 0.08 percent.
Question 18: D) saturated fat, sodium, and sugar
Question 19: B) Omega-3 fatty acids
Question 20: B) Difficulty concentrating and increased feelings of anxiety and depression
If you have any further questions, feel free to ask!