I think the answer is evolution.
Is there a list to pick from
Answer:
symbiotic relationship
Explanation:
A symbiotic relationship is a relationship in which the members of the relationship get benefits from each other....... In roots of leguminuous plants , the bacterias are the only source for nitrogen by plants & in turn plants provide food to bacterias
C. Silver.................
Example: when we exercise, breathing and blood circulation must increase to meet the demand of our cells to get rid of carbon dioxide and let in oxygen.
