Answer:
Stressor
Explanation:
Anything that causes stress is call a stressor
The spinal cord send nerve impulses to and from the brain
I think the answer is C. Ibuprofen.
It is letter B. Symbiosis
Symbiosis, a Greek word means living together. It is a specified class of a close and a long period of time natural interface between two different biological creatures – commensalistic, mutualistic, or parasitic.
Symbiosis can be necessary, which means that one or both symbionts completely depend on each other for existence and endurance, or either way they can generally live independently.
