Plants produce oxygen this oxygen gas which is important part of our air is gas that plants and animals must have in order to stay alive when people breeze it's the auction that we take out of the air into our cells and blood is there taking into the alveoli and this is where gas exchange takes place all the o2 available for living organisms come from plants
It seems to have choices. The exposure mutagens may lead to the mutation. When the mutation add up to a certain amount and can lead to cancer. So exposure mutagens will increase the cancer risk.
Im pretty sure its cell, species, biosphere. Hope i can help :)
