a feedback loop. an acquired trait. a balanced ecosystem. a symbiotic relationship.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When too much salt is detected in the bloodstream, the brain secretes a hormone that helps the body retain water by reducing the amount of urine produced. This is an example of
Possibilities:
- a feedback loop.
- an acquired trait.
- a balanced ecosystem.
- a symbiotic relationship.

a feedback loop.