Which is the relationship between plants and oxygen?

Plants take in carbon to do synthesis to make glucose and makes oxygen as result in simple terms. 

plants give off oxygen for animals to breathe and animals exhale CO2 which plants use to make glucose and take out more oxygen. Then animals eat plants to get glucose and when they die or defecate, they leave nitrogenous wastes which are eaten by plants (absorption through roots).\

can i have braniest ppllzzz

Amutation is basically the change in the gene, caused by alteration of single based units in the dna, or the genes or chromosomes were rearranged in the dna