This is a point mutation.
Without sunlight plants can undergo photsynthesis and cannot produce oxygen for humans to breathe and would cause the humankind to go extinct.
Photosynthesis makes glucose that is used in cellular respiration I think that’s how they work together
Through experiments and studies
It is domian, kingdom, phylum,class,order, family, species. aka. King Philip coughed on Fred and then he got sick
