When a salmon is ready to reproduce, It returns: to the stream where it was born
to the ocean
to a stream

When a salmon is ready to reproduce, It returns to the stream where it was born.

Explanation:

They do so because they 'know' it is a good place to spawn; they won't waste time looking for a stream with good habitat and other salmon. It offers salmon a higher chance of successful reproduction because it is a familiar area proven to be perfect for spawning.

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what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.