Question

physical activity helps prevent all of the following except: *
heart disease
certain cancers
type 2 diabetes
genetic disorders

what does cns stand for? *
central nervous services
center for nerve system
changing nervous system
central nervous system

the leading cause of death for american teens is: *
cancer
heart disease
diabetes

Explanation:

1. For the first question: Physical activity reduces risk of heart disease, certain cancers, and type 2 diabetes by improving bodily function, but cannot prevent genetic disorders which are inherited.
2. For the second question: CNS is a standard medical acronym for the body's primary nervous system structure.
3. For the third question: While the options shown are incomplete, the leading cause of death for American teens is unintentional injury (not listed in the provided options), but among the given choices, none are correct. However, based on common knowledge of the full set of options for this question, the intended correct answer is typically unintentional injury, but since it's not present, note that the provided options do not include the actual leading cause.

Answer:

1. Genetic disorders
2. Central nervous system
3. None of the provided options (the leading cause of death for American teens is unintentional injury, which is not listed here)