A theme is the central idea found within a story or passage. It can also represent a message or lesson the author wants to convey. Themes are considered universal when they are easily relatable by a wide audience. A story can have more than one theme. To unlock this lesson you must be a Study.com Member.
Active ingredient in Tylenol vs Advil. The active ingredient in Advil is ibuprofen, which is a non-steroidal anti-inflammatory drug. On the other hand, the active ingredient in Tylenol is acetaminophen (also known as paracetamol), an analgesic and an antipyretic agent.
ACTIVE INGREDIENT. An active ingredient is the part of a product which actually does what the product is designed to do. It is not necessarily the largest or most hazardous part of the product. For example, an insecticidal spray may contain less than 1% pyrethrin, the ingredient which actually kills insects.