Which of the following statements are considered to be normal? a. normal heart rates vary from 30 beats/minute up to 200 beats/minute. b. a heart rate less than or equal to 60 beats/minute is called bradycardia. c. a heart rate greater than or equal to 100 or 120 beats/minute is called tachycardia. d. a person’s heart rate will change depending on the needs of the body. e. b, c, and d are all correct.

there’s no image attached but i can if you want: )

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

paper covers rock.

explanation:

rock only smashes scissors.