- If something is made of something else , then that something else will be the component of that something
- Organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen
- Therefore, oxygen is a component of organic compounds

- Oxygen is a component of organic compounds
- A component of something means a part of something
- So, oxygen is a part of organic molecules

So, oxygen is a part of organic molecules
Question
Atoms of which of these elements are part of many organic molecules?

Context
- If something is made of something else , then that something else will be the component of that something 
- A component of something means a part of something 
- Organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen