Answer : controllable
Explanation: the second option
Approximately, at least 4,000 young people try smoking for the first time each day.
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During contraction, the filaments slide past he thick filaments, shortening the sarcomere. The thick and thin filaments do the actual work of a muscle, and the way they do this is pretty cool. Thick filaments are made of a protein called myosin. At the molecular level, a thick filament is a shaft of myosin molecules arranged in a cylinder. Thin filaments are made of another protein called actin. The thin filaments look like two strands of pearls twisted around each other.
The Correct answer is B: A posture disorder in which the spine curves up the back like a snake .
D wpuld be the best answer because dieting is the most important thing when losing weight. If she does add weight training the body fat will decrease and turn into lean muscle.
