Why are only inherited traits, not acquired ones, involved in the process of natural selection?

Here's what I get  

Explanation:

Inherited traits are traits that you received from your parents at birth.

Acquired traits are traits acquired during your lifetime, like knowing how to ride a bicycle. You cannot pass them down to the next generation.

Only your inherited traits will enable you to survive predators, find enough food to live, etc. If you must learn a skill to survive, you probably won't live long enough to pass your genetic information to your offspring.

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