Answer:
Cells are organized into tissues, which are organized into organs, which are organized into organ systems.
Explanation:
I believe the answer would be d.muscle cramps. Breathing in toxins seems like it could relate to the other three answers.
Sedentary individuals are often lethargic and show early symptoms of obesity. Less exercise means a slower metabolism. A slower metabolism means that even if an individual is eating what they normally should, it will take them a longer time to burn off the calories they gain.
I hope this will help u! Iron and calcium