Answer: commensalism
Explanation: commensalism is a type of association between organisms.in this association,one organism benefits and derives nutrition from the other.the other organism is neither harmed nor gains anything.
this is compared to parasitism where one organism benefits and the other is harmed.it is compared to mutualism,where both organisms involves benefits.
In the case of the question,the birds derives nutrition from the activity of the ant and the ant is undisturbed by the birds
Because humans and all other organisms use some combination of these elements. if we lost a whole species everything would be out of balance and we would slowly lose everything and in the in, causing a global scale extinction event. <span />
The answer for this is A.
The correct answer is (D) carbon dioxide. Oxygen will always be taken in and carbon dioxide released, never anything else regardless of the organism. I hope I helped! :)