Which of the following changes occur in a smoker's body after quitting? O Nothing, it takes 48 hours for changes to occur

O Risk of sudden heart attack increases

O Oxygen and carbon monoxide levels return to normal

O Risk of lung cancer increases

I THINK ITS  THE THIRD ONE

Explanation:

Within just 8 hours of quitting smoking, your body's oxygen levels will increase and your lung function will begin to improve. As your lungs begin to heal, you may feel less short of breath, cough less and find it easier to breathe in the coming weeks and months after you quit.

semen is the name of the fluid

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.