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.
Genetic characteristics that we can't control include the height and the amount of muscle fibers. Thus, the correct option is A.
Genetic characteristics may be defined as those characteristics or traits that an individual directly inherited from their parents. Such traits generally include physical structure, behavior, genetic diseases, disorders, etc.
The heart rate, flexibility, and the amount of daily exercise are those factors that can be voluntarily controlled by any individual with the help of some physical effort.
But height and the amount of muscle fibers are typically inherited from parents and hence such factors are not in the hands of any individual and can not be controlled by them.
The traits of height, behavior, physical appearance, etc, mostly depend on the parental gametes. Such types of traits are directly inherited to their offspring with some sort of variations during DNA fingerprinting.
Therefore, genetic characteristics that we can't control include the height and the amount of muscle fibers. Thus, the correct option is A.
To learn more about Genetic characteristics, refer to the link:
https://brainly.com/question/1278154
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