[Kyrie]

In addition to home-grown amino acids, the earth was probably exposed to amino acids that were formed inside nebulae in space, and which tend to be of the correct chirality. (I don't remember the reference.)

Remember that if your opponent has no direct knowledge of the science involved, and is merely claiming truth because "I read it somewhere", this constitutes a fallacious appeal to authority. Point this out to him. One should always be able to explain the logic and science behind one's argument rather than simply making vague reference to an anonymous source.

[Hunble]

Remember that if your opponent has no direct knowledge of the science involved, and is merely claiming truth because "I read it somewhere", this constitutes a fallacious appeal to authority. Point this out to him. One should always be able to explain the logic and science behind one's argument rather than simply making vague reference to an anonymous source.

Fair argument Kyrie, and something we must remember.

However, it is simply impossible for each individual to conduct the original scientific research. Providing credible sources is still allowed.

[general_re]

Remember that if your opponent has no direct knowledge of the science involved, and is merely claiming truth because "I read it somewhere", this constitutes a fallacious appeal to authority. Point this out to him. One should always be able to explain the logic and science behind one's argument rather than simply making vague reference to an anonymous source.

Fair enough. Here you go.