How to use "active" in a sentence

The gasp drew the deadly mist up his nose, where the active poison - a particularly fast-acting neurotoxin - was instantaneously absorbed through the sinus membranes

The active poison itself had already penetrated the victim's body, done its work, and begun to break down into a series of naturally occurring chemicals that would raise no alarms when the coroner later studied the results of the usual battery of forensic tests

He was a rag doll with only meager scraps of stuffing, a fragile and timorous creature, nothing whatsoever like the happy, vibrant, active boy that he had once been

On Earth they could not move without effort, but even at the end of their time here they remained active