Animal factory farms are immoral.

The fact that humans (in modern societies) can now have a healthy and fulfilling diet without the need to kill animals for their protein, makes it immoral to continue killing sentient beings just for their taste. If we can avoid killing it is our moral duty to do so.

Appeal To Belief

This argument appeals to the belief that any living creature(animal) is sentient while sentience itself is a heavily debated subject to which there never will be an answer(due to it's subjective nature)

Evolution is not observable.

The Theory of Evolution is a theory. A theory is a system of ideas. Therefore, the Theory of evolution is a system of ideas. Ideas are not observable. Therefore, the Theory of Evolution is not observable.

Appeal To Belief

https://en.wikipedia.org/wiki/Scientific_theory The premise states a false definition, or a common belief of the definition attributed to the word "theory". A scientific theory is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed, preferably using a written, pre-defined, protocol of observations and experiments.