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.
Keeping tabs on your exercise and eating habits can drastically change your lifestyle and for the better. When you have a journal you feel more motivated and in the end, you will not only eat healthier and exercise more often/vigorously, but you feel better.
So basically it keeps you motivated because you keep all of your physical data in one place.
It is recommended that you exercise within 55 to 85 percent of your maximum heart rate<span> for at least 20 to 30 minutes to get the best results from aerobic exercise</span>
The answer is B. Fragile… Osteoporosis is a condition that makes bones more fragile. ( risk of breaking easy)
The answer can be both increase in self-esteem and increase in aggression. All of the research generally points to increase of self esteem because during puberty self awareness is very prominant which increases self esteem. I would be safe and go with self esteem. I hope this helps.
