Which limiting factors are associated with s-shaped curves in population charts?

Which can writers improve their writing

[he] let his gaze wander to the swirling water of the stream racing madly beneath his feet. a piece of dancing driftwood caught his attention and his eyes followed it down the current. how slowly it appeared to move! what a sluggish stream! what contrasting words are used to describe the stream in this passage?

Which except is told from first-person point of view