Answer:
Pretty sure this is true. But another thing is ranking
Explanation:
Answer:
neck circles
Explanation:
tilting your head back could possibly demage your spine and vertebras
By he NIH trying a new drug to help reduce pain associated with sickle-cell anemia, it's an example of an "experiment".
An experiment involves a hypothesis (an educated guess as to what's going to happen) and trying out the hypothesis and finding the solution.
Answer:
I believe the correct answer is A) height and amount of muscle fibers!
Explanation:
You can mostly control your heart rate, you can control your flexibility, and you can control your daily amount of exercise.
You cannot control your height or amount of muscle fibers.
