Is panspermia a scienctific theory?

[tolbiny]

"Evolution would require that there were non-resistant strains which mutated and one of those mutations was resistance: such an environment should be reproducible and testable -- has it been?"

yeah, i did this in biology lab last semester. Its pretty simple really. You take a culture of bacteria and create a control environment- a plate of agar gel with antibiotics. A second plate with antibiotcs and a mutagenic substace. Using the same culture for both you will see colonies growing on the plate with the mutagenic substance.


"Has any scientist caused speciation in single-celled organisms?"
Speciation in single cell organisms is different from other organisms because they reproduce asexually, so you can't use traditional definitions of species on them- which is why "strains" are used and not species when describing bacteria and stuff.

"And yes most mutations are harmful" most mutations are not harmfull, most mutations are considered "neutral".