Iron is required for your hemoglbin in your blood to transport oxygen effectivly. Since iron has a charge of +6, and oxygen has a charge of -6, the iron in the blood will attract the oxygen in the lungs, and then the blood delivers it to the cells in need of oxygen.
Almost all plants benefit humans
they benefit humans by eating chicken breats
It can have sex with its self and have babies and can fertilize its own egg.
Not really. In symbiosis, each partner derives benefit from the partnership. While rats benefit from humans, humans do not benefit from rats.
humans are animals and they benefit from eating cows. humans also benefit from drinking the milk of cows.
no they are not
We do it, not on purpose, but in trying to machine objects We benefit indirectly by producing products cheeper
For food
yes
they don't
it helps
Pet therapy!