Final answer:
Storing poisonous substances out of reach, consistently using safety caps, and storing all poisonous substances in a locked cabinet are effective actions to prevent poisoning in toddlers.
Step-by-step explanation:
Storing poisonous substances out of reach is one of the best actions to prevent poisoning in toddlers. This ensures that toddlers are unable to access harmful substances and reduces the risk of accidental ingestion. Consistently using safety caps and storing all poisonous substances in a locked cabinet can also be effective preventive measures.