Answer:
reciprocal
Step-by-step explanation:
Reciprocal altruism: In evolutionary biology, the term reciprocal altruism is defined as a particular behavior in which a specific organism acts in a certain manner or way that leads to temporary reduction of its fitness, therefore, increases the other organism's fitness and holding an expectation that the other organism will act or behave the same way in future. It can happen between individuals who are non-relative.
In the question above, the given concept is called reciprocal altruism.