C. is the answer because there us mutualism between both species.
The air can be considered polluted once harmful or toxic substances are being released and introduced into the air and can bring many types of diseases or health problems to the living organisms in it. Some actions can be done in order to remedy air pollution and these include: government passing regulatory laws, testing for car emissions and carpooling so there will be less driving.
They exhibit, Growth, metabolism, reproduction, cellular organization, homeostasis, heredity, and response to stimuli.
