NASA Curiosity rover finds ancient organic molecules on Mars

An ancient Martian lake bed has revealed organic molecules that are 3 billion years old. These molecules, which contain carbon, are essential for life and can originate from both living and non-living sources. NASA's Curiosity rover conducted a sample analysis on Mars, heating samples to release hydrocarbons, which might be fragments of larger molecules. While these organics could have biological origins, they might also result from geological processes or meteor impacts.

What are the possible sources of the organic molecules found on Mars according to NASA?

How might organic molecules on Mars have formed, based on the information provided?