A standard contains a known amount of a substance. If u are performing an experiment you will use a sample with a known concentration to create a standard curve (a straight line). Positive and negative controls are measured against the standard curve to show the expected results if the sample u will be testing is positive or negative.
Answer:
It is because that the BMI determine the actual weight. It helps you know whether you are obese, underweight and overweight.
Answer: Yes, activities like aerobics help to have a healthy heart and that is why I like to do them.
Explanation: The exercises not only help the physical appearance but also health. A healthy heart is vital so that a person can live his daily life in a normal way and without any type of problems. In my case, I like to do aerobics or some type of cardio since these exercises help to maintain a young heart. Remember that these activities must be accompanied by a good diet.
It is called a horizontal relationship
