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.
It's bc use some countries overuse the opportunity for fast food and junk food
Cancer, such as heart cancer, lung cancer, skin cancer
Answer: Kallie should focus on the type; performing a different activity to achieve her goal (Option D)
Explanation: As Kallie is already giving a lot of time in practicing and her technique and energy output are outstanding, so her frequency, intensity and time in the FITT cycle are being completed.
She should focus on the type of activity she is performing. She should change it and see if it would make her tennis serve better.
